ASome farmers in California are having a hard time picking their crops. There are not enough workers to help them with the harvest.One farmer used to grow peaches（桃子）, but will soon grow almonds（杏仁）instead. Peaches require more labor to harvest. They are easy to be damaged and need careful hand picking. He is now removing his peach trees. Then he will plant almond trees in their places. Almonds are harvested differently. It does not take as many workers to pick them because a machine shakes the almond trees The nuts fall on the ground and then are gathered up The farmer does not have to hire many workers.Some farmers think there are two reasons why they can't find enough farm workers. One reason is that there are a lot of well-paid construction jobs in the area. Many people are taking these jobs instead of picking fruit. The other reason is that it has become more difficult for workers to come from Mexico into California. Fewer workers are allowed to get into the country to work on the fruit farms. To settle the problem, farmers hope the government might allow these workers to work as guests. That would help workers provide for their family and help farmers harvest their crops. When the harvest season is over they'll go back home. Farmers say that unless things change, more fruits will come from other countries. This is because labor is cheaper in those countries than in the United States.What problem do some farmers have?

ASome farmers in California are having a hard time picking their crops. There are not enough workers to help them with the harvest.One farmer used to grow peaches（桃子）, but will soon grow almonds（杏仁）instead. Peaches require more labor to harvest. They are easy to be damaged and need careful hand picking. He is now removing his peach trees. Then he will plant almond trees in their places. Almonds are harvested differently. It does not take as many workers to pick them because a machine shakes the almond trees The nuts fall on the ground and then are gathered up The farmer does not have to hire many workers.Some farmers think there are two reasons why they can't find enough farm workers. One reason is that there are a lot of well-paid construction jobs in the area. Many people are taking these jobs instead of picking fruit. The other reason is that it has become more difficult for workers to come from Mexico into California. Fewer workers are allowed to get into the country to work on the fruit farms. To settle the problem, farmers hope the government might allow these workers to work as guests. That would help workers provide for their family and help farmers harvest their crops. When the harvest season is over they'll go back home. Farmers say that unless things change, more fruits will come from other countries. This is because labor is cheaper in those countries than in the United States.Why does the peach farmer start to plant almonds?

ASome farmers in California are having a hard time picking their crops. There are not enough workers to help them with the harvest.One farmer used to grow peaches（桃子）, but will soon grow almonds（杏仁）instead. Peaches require more labor to harvest. They are easy to be damaged and need careful hand picking. He is now removing his peach trees. Then he will plant almond trees in their places. Almonds are harvested differently. It does not take as many workers to pick them because a machine shakes the almond trees The nuts fall on the ground and then are gathered up The farmer does not have to hire many workers.Some farmers think there are two reasons why they can't find enough farm workers. One reason is that there are a lot of well-paid construction jobs in the area. Many people are taking these jobs instead of picking fruit. The other reason is that it has become more difficult for workers to come from Mexico into California. Fewer workers are allowed to get into the country to work on the fruit farms. To settle the problem, farmers hope the government might allow these workers to work as guests. That would help workers provide for their family and help farmers harvest their crops. When the harvest season is over they'll go back home. Farmers say that unless things change, more fruits will come from other countries. This is because labor is cheaper in those countries than in the United States.Why can't some farmers find enough workers to pick fruit?

ASome farmers in California are having a hard time picking their crops. There are not enough workers to help them with the harvest.One farmer used to grow peaches（桃子）, but will soon grow almonds（杏仁）instead. Peaches require more labor to harvest. They are easy to be damaged and need careful hand picking. He is now removing his peach trees. Then he will plant almond trees in their places. Almonds are harvested differently. It does not take as many workers to pick them because a machine shakes the almond trees The nuts fall on the ground and then are gathered up The farmer does not have to hire many workers.Some farmers think there are two reasons why they can't find enough farm workers. One reason is that there are a lot of well-paid construction jobs in the area. Many people are taking these jobs instead of picking fruit. The other reason is that it has become more difficult for workers to come from Mexico into California. Fewer workers are allowed to get into the country to work on the fruit farms. To settle the problem, farmers hope the government might allow these workers to work as guests. That would help workers provide for their family and help farmers harvest their crops. When the harvest season is over they'll go back home. Farmers say that unless things change, more fruits will come from other countries. This is because labor is cheaper in those countries than in the United States.What will happen if the situation does not improve?

BScientists have long tried to be able to know more about floods. So far, the best that scientists can do is to recognize theconditions for flooding.Although deep snow alone seldom causes floods, when it occurs together with heavy rain and sudden warmer weather, it can lead to seious flooding. If there is a fast snow melt（融化）on top of frozen or very wet ground, flooding is likely to occur. Melting snow also causes high water levels in rivers' flooding the nearby landRivers covered in ice can also lead to flooding. When ice begins to melt, it breaks into large pieces. These pieces of ice move and float down the river. They can block the river, causing the water to rise and flood the land up the river. If the ice dam（坝）breaks suddenly, the large quantity of water held behind it can flood the areas down the river too.Broken ice dams are not the only problem that can cause flooding. When a large human-made dam breaks or fails to hold the water collected behind it. it will also cause serious damage.Although scientists cannot always know when floods will occur, they do know a great deal about when floods are likely, or probably, going to occur.What have scientists achieved in dealing with floods?

BScientists have long tried to be able to know more about floods. So far, the best that scientists can do is to recognize theconditions for flooding.Although deep snow alone seldom causes floods, when it occurs together with heavy rain and sudden warmer weather, it can lead to seious flooding. If there is a fast snow melt（融化）on top of frozen or very wet ground, flooding is likely to occur. Melting snow also causes high water levels in rivers' flooding the nearby landRivers covered in ice can also lead to flooding. When ice begins to melt, it breaks into large pieces. These pieces of ice move and float down the river. They can block the river, causing the water to rise and flood the land up the river. If the ice dam（坝）breaks suddenly, the large quantity of water held behind it can flood the areas down the river too.Broken ice dams are not the only problem that can cause flooding. When a large human-made dam breaks or fails to hold the water collected behind it. it will also cause serious damage.Although scientists cannot always know when floods will occur, they do know a great deal about when floods are likely, or probably, going to occur.When will deep snow lead to floods?

BScientists have long tried to be able to know more about floods. So far, the best that scientists can do is to recognize theconditions for flooding.Although deep snow alone seldom causes floods, when it occurs together with heavy rain and sudden warmer weather, it can lead to seious flooding. If there is a fast snow melt（融化）on top of frozen or very wet ground, flooding is likely to occur. Melting snow also causes high water levels in rivers' flooding the nearby landRivers covered in ice can also lead to flooding. When ice begins to melt, it breaks into large pieces. These pieces of ice move and float down the river. They can block the river, causing the water to rise and flood the land up the river. If the ice dam（坝）breaks suddenly, the large quantity of water held behind it can flood the areas down the river too.Broken ice dams are not the only problem that can cause flooding. When a large human-made dam breaks or fails to hold the water collected behind it. it will also cause serious damage.Although scientists cannot always know when floods will occur, they do know a great deal about when floods are likely, or probably, going to occur.What happens when ice dams break?

CIt was Sharing Day! The teacher had asked the students to bring something interesting to class.Jimmy found the little box he and Dad had made. Inside was a piece of rock, a sand dollar and a shark（鲨鱼）tooth. Nobody could have anything as interesting as these!In class, Jimmy waited anxiously, hoping to be called on first by the teacher. But Kara was first. She held up a sand dollar. Jimmy's eyes grew big."I found this on the beach," Kara said. "It's interesting. The little holes that make the sand dollar look like a flower are breathing holes. See all the needles? They help the sand dollar move and dig into the sand."Jimmy was a little uneasy. Oh, well, he still had his rock and shark tooth.Then Mark stood up. "This is my favorite rock, called pumice（浮石）." Then Mark dropped the rock into a glass of water. "Look! Pumice is the only rock that floats!"Jimmy put up his hand and waved, but the teacher called on Justin instead."I found this shark tooth in Hawaii last Christmas," Justin said.The class was excited, but Jimmy lowered his head."Sharks have rows of teeth. Every time a shark loses a tooth, another one takes its place." Justin passed the tooth around.Jimmy heard the teacher call him. He stood on one foot and then the other. "Well, ah, see… my treasure box is interesting! It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It smells good, reminding us of camping.""What's inside?" asked Lisa.Jimmy opened his box. "A sand dollar, a piece of pumice and a shark tooth."His classmates' mouths dropped open. The teacher looked at the objects in the box and smiled. "Now that's interesting!" he said.On the Sharing Day, Jimmy_____.

CIt was Sharing Day! The teacher had asked the students to bring something interesting to class.Jimmy found the little box he and Dad had made. Inside was a piece of rock, a sand dollar and a shark（鲨鱼）tooth. Nobody could have anything as interesting as these!In class, Jimmy waited anxiously, hoping to be called on first by the teacher. But Kara was first. She held up a sand dollar. Jimmy's eyes grew big."I found this on the beach," Kara said. "It's interesting. The little holes that make the sand dollar look like a flower are breathing holes. See all the needles? They help the sand dollar move and dig into the sand."Jimmy was a little uneasy. Oh, well, he still had his rock and shark tooth.Then Mark stood up. "This is my favorite rock, called pumice（浮石）." Then Mark dropped the rock into a glass of water. "Look! Pumice is the only rock that floats!"Jimmy put up his hand and waved, but the teacher called on Justin instead."I found this shark tooth in Hawaii last Christmas," Justin said.The class was excited, but Jimmy lowered his head."Sharks have rows of teeth. Every time a shark loses a tooth, another one takes its place." Justin passed the tooth around.Jimmy heard the teacher call him. He stood on one foot and then the other. "Well, ah, see… my treasure box is interesting! It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It smells good, reminding us of camping.""What's inside?" asked Lisa.Jimmy opened his box. "A sand dollar, a piece of pumice and a shark tooth."His classmates' mouths dropped open. The teacher looked at the objects in the box and smiled. "Now that's interesting!" he said.What does a sand dollar look like according to Kara?

CIt was Sharing Day! The teacher had asked the students to bring something interesting to class.Jimmy found the little box he and Dad had made. Inside was a piece of rock, a sand dollar and a shark（鲨鱼）tooth. Nobody could have anything as interesting as these!In class, Jimmy waited anxiously, hoping to be called on first by the teacher. But Kara was first. She held up a sand dollar. Jimmy's eyes grew big."I found this on the beach," Kara said. "It's interesting. The little holes that make the sand dollar look like a flower are breathing holes. See all the needles? They help the sand dollar move and dig into the sand."Jimmy was a little uneasy. Oh, well, he still had his rock and shark tooth.Then Mark stood up. "This is my favorite rock, called pumice（浮石）." Then Mark dropped the rock into a glass of water. "Look! Pumice is the only rock that floats!"Jimmy put up his hand and waved, but the teacher called on Justin instead."I found this shark tooth in Hawaii last Christmas," Justin said.The class was excited, but Jimmy lowered his head."Sharks have rows of teeth. Every time a shark loses a tooth, another one takes its place." Justin passed the tooth around.Jimmy heard the teacher call him. He stood on one foot and then the other. "Well, ah, see… my treasure box is interesting! It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It was just a piece of wood until Dad and I cut it into pieces and finally made a box out of it. It smells good, reminding us of camping.""What's inside?" asked Lisa.Jimmy opened his box. "A sand dollar, a piece of pumice and a shark tooth."His classmates' mouths dropped open. The teacher looked at the objects in the box and smiled. "Now that's interesting!" he said.Who shared with the class a rock that floats?