高中英语人教版选修六Unit 4 Global warming同步练习 (3)

    You might think that “global warming” means nothing more than a rise in the world's temperature. But rising sea levels caused by it have resulted in the first evacuation (撤离) of an island nation, the citizens of Tuvalu will have to leave their homeland.

    During the 20th century, sea level rose 8~12 inches. As a result, Tuvalu has experienced lowland flooding of salt water that has polluted the country's drinking water.

    Paani Laupepa, a Tuvaluan government official, reported to the Earth Policy Institute that the nation suffered an unusually high number of fierce storms in the past ten years. Many scientists connect higher surface water temperatures resulting from global warming to greater and more damaging storms.

    Laupepa expressed dissatisfaction with the United States for refusing to sign the Kyoto Protocol, an international agreement calling for industrialized nations to reduce their greenhouse gas emissions (排放), which are a main cause of global warming. “By refusing to sign the agreement, the US has effectively taken away the freedom of future generations of Tuvaluans to live where their forefathers have lived for thousands of years.” Laupepa told the BBC.

    Tuvalu has asked Australia and New Zealand to allow the gradual move of its people to both countries.

    Tuvalu is not the only country that is vulnerable (易受影响的) to rising sea levels. Maumoon Gayoon, president of the Maldives, told the United Nations that global warming has made his country of 311,000 an “endangered nation”.

    Many facts suggest that children are overweight (超重的) and the situation is getting worse, according to the doctors. I feel there are a number of reasons for this.

    Some people blame the fact that we are surrounded by shops selling unhealthy, fatty foods, such as fried chicken and ice cream, at low prices. This has turned out a whole generation of grown-ups who seldom cook a meal for themselves. If there were fewer of these restaurants, then probably children would buy less take-away food.

    There is another argument that blames parents for allowing their children to become overweight. I agree with this, because good eating habits begin early in life, long before children start to visit fast food shops. If children are given fried chicken and chocolate rather than healthy food, or are always allowed to choose what they eat, they will go for sweet and salty foods every time, and this will carry on throughout their lives.

    There is a third reason for this situation. Children these days take very little exercise. They do not walk to school. When they get home, they sit in front of the television or their computers and play computer games. Not only is this an unhealthy pastime (消遣), it also gives them time to eat more unhealthy food. What they need is to go outside and play active games or sports.

    The above are the main reasons for this problem, and therefore we have to encourage young people to be more active, as well as steering them away from fast food shops and bad eating habits.

    There are two main (reason) why the temperature of the air is always (change). One reason is that the air around you (move) in from somewhere else. Air usually moves in large bodies (call) air masses. Some air masses move in from the north. These air masses usually have cold air that causes the temperature (drop). Air masses also move in from the south. They usually have warmer air that causes the temperature to rise.

    Temperature changes during the day or night can be great small. This depends (part) on how many clouds are in the sky. there are many clouds during the night, they act like covers on your bed. They blanket the earth and keep the air from (lose) much of its heat. The temperature usually does not drop much during such a night. When there are many clouds during day, some of the sun's energy will not reach the earth. The temperature usually does not rise much on such a day.

    Nowadays a vegetarian (素食的) lifestyle is becoming more and more popular. Keeping a vegetarian diet is one of the best things we can do.

     A well planned vegetarian diet provides us with all the nutrients (营养素) we need and avoids fat, cholesterol (胆固醇) found in animal flesh, eggs, and dairy foods. And it can provide protection against various kinds of diseases, including the three biggest killers: heart disease, cancer, and other serious diseases. The American Dietetic Association states that vegetarians have lower rates of death from heart disease, lower blood cholesterol levels, lower blood pressure and lower rates of high blood pressure. Scientists have also found that vegetarians have stronger immune systems than their meat-eating friends. Vegetarians live, on average, 6 to 10 years longer than meat eaters.

     Animals raised for food consume the vast majority of their calories simply in order to live, just as we do. We feed more than 70 percent of the grains to farm animals. So it's really a huge waste, isn't it? Try your best to find tips on the health benefits of a vegetarian diet.

A. Growing all the crops needed to feed animals requires great amounts of water and land.

B. This means that they are less likely to be affected by everyday illnesses like the flu.

C. Vegetarian diets are the only diets that work for long term weight loss.

D. All of these diseases are more likely to happen to meat eaters.

E. Healthy vegetarian diets support a lifetime of good health.

F. It's never too late to turn over a new page.

G. Living on plants also saves energy.