Section A Welcome to the unit & Reading
I. 短文 填空
请根据短文内容及所给首字母提示，补全所缺单词。
In the past hundred years, there have been frequent natural d 1 , such as floods, droughts, debris flows, seismic sea waves, earthquakes, windstorms and the stretching of new deserts. The disasters have k 2 millions of people, destroyed large numbers of houses, and c 3 uncountable losses to human beings.
Now more and more people have become a 4
that those disasters have much to do with w 5
we have done to the earth. We have cut d 6
too many trees in the forests, we have badly p 7
the environment, and we have shocked our own home-planet time and again with extremely powerful explosions（爆炸）of nuclear bombs. As a result, climates become abnormal（反常的）, rainwater rushes down hillsides angrily and the underground energy goes up to revenge（报复）itself on us.
The earth is our only home-planet. It is u 8
for us to stop damaging it and to do our best
