South AmericaLocated mostly（most) in the southern half of the earth, South America is a very (41)_____(interest) continent. The northern part of the continent is (42)_____(cover). By the Amazon Rainforest, which is home to thousands of the plant animal species. It is a very important force (43)_____ (shape) the world's weather and climate patterns. And it is also important for the (44)_____ (develop) of the economy of South America. Products such as chocolate, rubber, coffee and many kinds of medicine are (45)_____ (harvest) from the plants found in the rainforest. Even the liquid from the skin of some species of tree frogs are being used as (46)_____ (experiment) medicines. Other parts of South America are very (47)_____ (differ).The Andes Mountains spread over the (48)_____（west) part of South America. The ranges, about 5500 miles long, are a continuous barrier, with many peaks rising beyond 2000 (49)_____（foot). Southern South America is an extremely (50)_____ (wind) and cold place where many species of penguins(企鹅), seals and whales live.

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The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated．Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.The right-handers arc nine times as many as the left-handers.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.Using a can opener could be a problem for left-handers.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.Men are more likely to be left-handed than women.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.Some scientists believe that handedness is decided by genes.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.Most left-handers are right-brain dominant.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.In the 19th century, left-handedness was no longer considered abnormal.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.Right-handers live longer than left-handers.

The Truth about Left-Handed PeopleAbout 90% of people in the world today arc right-handed. The other 10% arc left-handed, including Obama, the President of the US. Every day, left-handed folks quietly face problems. It could be something as simple as driving a car or using a can opener.Why are so few of us left-handed? One theory is that handedness （hand preference） could be a result of genetics. Scientists say that there are two genes（基因）associated with handedness. One is the D gene. It is more frequent in the population and promotes（促成）right-hand preference. The other is the C gene. It has the ability to promote a preference for cither hand. When the C gene is present, there is a 50% chance that a person could be right- or left-handed.Another theory has to do with human brains, which arc made up of two halves. If the left half is more powerful, then one is most likely right-handed. But with left-handers, it is more complicated. Seventy percent of them are also left-brain dominant（占优势的）. The other 30% have right-side dominant brains.During the 18th and 19th centuries, left-handedness was considered a disability. But not all of the myths about left-handers are bad. One myth suggests that they are more creative and smarter than the right-handers. So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.Left-handers are proved to be cleverer.