【概括大意】A good rule of thumb(好的做法)is to take your body weight in pounds and divide that number in half. That gives you the number of ounces(盎司)of water per day that you need. For example, if you weigh 160 pounds, you should drink at least 80 ounces of water per day. If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active. If you drink coffee or alcohol, you should add at least an equal amount of water. When you are traveling on an airplane, it is good to have 8 ounces of water for every hour you are on board the plane.The main idea of this paragraph is__________.

【概括大意】Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals, but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise, the older the massive volcanic eruptions were, the more damage they seemed to do.The main idea of this paragraph is__________.

【阅读理解】The other side of a state legal apparatus is a state military apparatus. While the one protects the individual from violence, the other sacrifices the individual to violence in the interests of the state. In war the state affirms supreme power over the individuals within its own borders. War is not simply a trial by combat to settle disputes between states; it is the moment when the state makes its most powerful demands upon its people for their commitment, allegiance, and supreme sacrifice. Times of war test a community’s deepest religious and ethical commitments. What can we learn from the paragraph?

【阅读理解】The great sea voyages of Europe’s "Age of Discovery," such as Christopher Columbus’s trip to the West Indies in 1492, would have been impossible without the use of a compass. This great device for sea voyages was introduced to the West from China during the thirteenth century We have to thank ancient Chinese for their invention of the compass.What is the paragraph mainly about?

【阅读理解】The problem of leisure is new. Until very recent times people worked each day to the limit of their strength. Of course there were always a privileged few who had leisure; but most men had to work 12, 14, or even 16 hours a day, six days a week. As late as 1840 the average factory worker labored 72 hours a week. “Sunup to sundown” was the farmer’s day, or as another phrase puts it, “from can to can’t.”The phrase “from can to can’t” means ______.

【概括大意】Wignall calculated the "killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava that they produced. He found that size for size, older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.The main idea of this paragraph is __________.

【概括大意】I love sunny days because they are ideal for outings. I remember the sunny weekend when two roommates and I had a marvelous time in the old Summer Palace. Under the blue sky, the trees are bathed in golden light. On rainy days, I enjoy the sound of raindrops beating on the windowpanes. I watch the rain washing the trees and grass clean, knowing they will glitter when it clears up and hoping a rainbow will follow. In winter, a heavy snowfall offers a different type of pleasure. Cold as it often is, I always go outdoors and leave my footprints in the thick snow while throwing snowballs and making snowmen with my fellow students.The main idea of this paragraph is__________.

【概括大意】Deaf people—people who can’t hear—are still able to communicate quite well, with a special language. It’s called sign language. The speaker of sign language uses hand gestures in order to communicate. Basic sign language has been used for a long, long time. But sign language wasn’t really developed until about 250 years ago. In the middle of the 1700’s, a Frenchman named Epee developed sign language. Epee was able to speak and hear, but he worked during most of his life as a teacher of deaf people in France. Epee developed a large number of vocabulary words for sign language. Epee’s system used mostly “picture-image” signs. We call them picture-image signs because the signs create a picture.The main idea of this paragraph is__________.

【完成句子】The biggest advance in early detection is continuous watch from weather satellites. With these, we can see the storms form and track them fully, from birth to death. While they can still kill people and destroy property, hurricanes will never surprise any nation again.Using weather satellites can ensure _____________ of hurricanes.

【概括大意】There is a vital need to understand the potential risks and long-term health effects of living on naturally contaminated soils. Future environmental investigations of naturally polluted soils should concentrate on the potential pathways of metals into the food chain and human body. Geologists should be part of such studies as they can provide the essential background information on rock and soil chemistry as well as the chemical forms of heavy metal pollution.The main idea of this paragraph is __________.