分析 whether your coat needs washing．
解答 答案：whether your coat needs washing．這里是主從復合句，作為wonder的賓語從句，引導詞是whether，后加陳述語序，主語是your coat，主句是一般現在時，從句時態不受限制，這里是說是否需要，用一般現在時，主語是三單，故用needs需要，need doing sth主動的形式表示被動，故wash洗的動名詞是washing，故答案是whether your coat needs washing．
點評 賓語從句的三要素是引導詞，時態和語序．還要注意need doing sth的用法．
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The earth is 4 600 million years old. We humans have lived on earth for only 35 000 years, but during this period we have changed our planet a lot in many ways. Some things we’ve done are very good for the earth while some are bad.
All over the world, people have cut down millions of trees. When it rains or when the wind blows, the earth is taken away. Forests have become deserts, so more and more sorts of animals and plants are disappearing.
In big cities, cars and buses have polluted the air. Many people in cities now have health problems.
Factories have also polluted the land and the water. As a result, many rivers and lakes are nowdead.
Around the earth, there’s a special kind of oxygen called “ozone”(O3). It is important to theearth. But now air pollution is destroying it and that has made a very big hole in the ozone layer. Too much harmful radiation from the sun passes through the hole and reaches the earth directly. This is very dangerous because this kind of radiation can cause cancer.
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