阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。（共8分，每小题2分）
April 22 is Earth Day. Everyone on earth should care about and protect the earth! The earth has warmed by about 1 °F over the past 100 years, but why and how? Well, scientists are not quite sure. Maybe the earth gets warmer and warmer on its own. 1
First, greenhouse effect (效应) is a very important reason for the change of the earth. People give out too much energy into the air every year. It makes the earth warmer. 2 Sometimes it bees too hot and sometimes too cold. Sometimes there is too much rain and sometimes too little. The change of the climate makes the earth warmer. In turn, the warmth of the earth changes the climate, too.
When the earth bees warmer, there may be more rain and a rise in sea level. 3 On a Pacific island, 100 people have to move to higher ground because the sea is rising. These people can no longer live on the coast. Before that, two islands without people went underwater in 1999. Scientists say that the seas can rise by nearly one metre by 2100.
People can affect the earth's air, land and water. As for us, we can do many things to protect the earth. 4 We can tell more people about protecting the earth.
A.So it will affect the growth of plants, animals and people.
B. But many scientists say that people are doing many things which make the earth warmer.
C.For example, we can use fridges less.
D. People in many cities turn off the lights for an hour on that day.
E.Another important reason is climate change.
B
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(答案→)B
解析：这篇短文中作者主要分析了地球变暖的原因，并号召我们行动起来保护地球。
【小题1】联系上文，地球变得越来越暖和，及下文描述，可知选B，但是许多科学家说人们做了许多事情导致地球变暖。
【小题2】联系下文，有时气候变得太热有时太冷。可知气候变化的结果，故选E，另一个重要原因是气候变化。
【小题3】联系下文描述，可知指的是对地球上生物的影响，故选A，因此它会影响植物的生长，动物和人类。
【小题4】联系上文，我们可以做许多事情来保护地球，及下文描述，可知选C，例如，我们可以少用冰箱。