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閱讀下面短文，并借助上下文內容，在空格里填上一個合適的單詞，使短文合理通順。
One cool April 22 morning, people started the day as usual. Yet it was not a normal day. What’s so special about April 22? The answer is simple. It is Earth Day. People all 小題1: the world celebrate this important day. The idea of having a special day to celebrate Earth began 小題2: the 1960s. Life was very different then. Few people talked or even thought about the environment. Most people had no idea 小題3: dirty our air and water were.

On April 22, 1970, twenty million Americans 小題4:   part in the first Earth Day activities. They showed that people really did want to do something about the environment. Since then many countries have passed 小題5:    to protect the air, water, land and animals.
The vehicles such as cars and buses must pass tests to make sure that they don’t cause too 小題6:     pollution. Thanks to the laws, cars today release (排放) about half as many bad chemicals as cars did in 1970. As a 小題7:  , the air is cleaner than it once was.
Rivers and lakes are also cleaner today than before. It’s a good thing. The Cuyahoga River in Ohio was so polluted 小題8:   rubbish and oil on the river even caught 小題9:   ! Today, the river is cleaner. It no longer burns. It’s healthy enough for birds, fish, and other animals.
Now the celebration has spread to other countries. More than 175 countries celebrate it each year. We should 小題10:   our best to help keep our planet healthy.

小題1:over / around
小題2:in
小題3:how
小題4:took
小題5:laws
小題6:much
小題7:result
小題8:that
小題9:fire
小題10:try / do

試題分析：短文大意：這篇短文主要講述了地球日的由來，以及環境污染對我們星球的傷害，告訴我們要行動起來保護我們的星球。
小題1:結合語境可知本句指的是，全世界的人都慶祝這個重要的日子。短語all over/all around到處,四處.故填: over / around
小題2:結合語境可知本句指的是,這種活動開始于60年代.in表示在某個時間范圍,故用介詞I,在里面.n
小題3:結合語境可知本句指的是，大部分人不知道我們的空氣和水是多么的臟。故填how ，如何，怎樣。
小題4:結合語境可知本句指的是，在1970年4月22日，兩千萬美國人參加了第一次地球日活動。本句描述的是過去發生的動作，故用一般過去時態。短語take part in參加，故填過去式動詞took。
小題5:結合語境可知自從那時以來許多國家通過法律來保護空氣，水，土地和動物。故填復數名詞laws，法律。
小題6:結合語境可知本句指的是，不引起太多的污染。英語中pollution表示抽象含義，不可數，故填much，許多，大量。
小題7:聯系前一句描述，可知本句指的是，結果，空氣比以前清新多了。短語as a result結果是，故填名詞result，結果。
小題8:結合語境可知本句指的是，俄亥俄州的凱霍加河污染是如此嚴重，以至于上面的垃圾和油都引起來大火。短語so……that如此……以至于，故填that .
小題9:聯系下文It no longer burns.描述，可知本句指的是，垃圾和油起了火。故填名詞fire，火。
小題10:結合語境可知本句指的是，我們應該盡力讓我們的星球保持健康。短語try / do one’s best do do sth盡力做某事，本句中should為情態動詞，故填原形動詞try/do.

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