Rivers are one of our most important natural resources. Many of the world’s great cities are ____1.____ (locate) on rivers, and almost ____2._____ country has at least one river flowing through it that plays _____3._____ important part in the lives of its people.

Since the beginning of history, people ____4.____ (use) rivers for transportation. The longest one in the United States is the Mississippi, and the lifeline of Egypt is the Nile. ____5._____ transportation, rivers give water to drink, water for crops, and chances for fun and recreation for the people ____6.___ live along their banks.

However, large cities and industries that are located on rivers often make problems. As the cities grow ___7._____ size and industries increase in number, the water in the rivers becomes _____8.____ (pollute) with chemicals and other materials. People are learning the ____9._____ (important) of doing more to keep their rivers clean ____10.____ they want to enjoy the benefits of this natural resource.

located

1.every/each

2.an

3.have been using/have used

4.Besides

5.who/that

6.in

7.polluted

8.importance

9.if/because

【解析】

試題分析：河流對(duì)于幾乎任何一個(gè)國家都很重要，而保護(hù)河流也顯得極為重要了。

1.…位于”，be located:“位于”，故該空填located.

2.country可知，該空不填all，而填every/each.

3.lay an important part in:“起到重要作用”，故該空填不定冠詞an.

4.Since the beginning of history,”可知其所修飾限定的謂語應(yīng)為現(xiàn)在完成（進(jìn)行）時(shí)，故該空填have been using/have used.

5.Besides接賓語transportation，表示“除了運(yùn)輸之外，（還…）”。

6.people，且關(guān)系詞代替其在定語從句中充當(dāng)主語，故該空正確答案為who/that.

7.…方面”：in，該句句意：“隨著城市‘在規(guī)模上的’擴(kuò)大、工業(yè)在數(shù)量上的增加，河里的水變得…”，故該空應(yīng)填介詞in.

8.olluted“被污染的”。

9.importance.

10.if/because.

考點(diǎn)：重點(diǎn)詞匯、短語及句式

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