17.Rivers are one of our most important natural resources.Many of the world's great cities are(76)located on rivers,and almost each country has at (77)least one river flowing through it that(78)plays an important part in the lives of its people.Since the beginning of history,people has used rivers for(79)transportation(運(yùn)輸).Besides,rivers give water to(80)drink,water for crops,and chances for fun and recreation
for the people who live along their banks.(81)However,large cities and industries that are located on (82)rivers often make problems.As the cities grow(83)insize and the industries increase in number,the water in the rivers become(84)spolluted(污染) with chemicals.People are learning the importance to keep their rivers clean if they want to enjoy this (85)natural(自然的) resource.

分析 本文是一篇記敘文.本文講述了作為人類最重要而自然資源之一,河流的起到的重要作用以及面臨的污染問題.

解答 76.located  考查動(dòng)詞的時(shí)態(tài)語態(tài).根據(jù)句意,這里表示"坐落于",且主語為物,故用"be located+介詞+地點(diǎn)"表被動(dòng).
77.least  考查固定搭配.根據(jù)句意,這里表示幾乎每個(gè)城市都至少有一條河流,故用at least.
78.plays  考查動(dòng)詞的時(shí)態(tài)和固定搭配.根據(jù)句子成分分析可知,這里that用來引導(dǎo)定語從句且在句中做主語,表示"在…中起重要作用"要用"play an important part in",再根據(jù)主謂一致原則,故填plays.
79.transportation  考查名詞.根據(jù)前面的介詞for可知,這里要用名詞作賓語,故填transportation.
80.drink  考查非謂語動(dòng)詞.做目的狀語的非謂語動(dòng)詞只能用to do不定式表示,前面已經(jīng)有了to,故填動(dòng)詞原形drink即可.
81.However 考查連詞.根據(jù)前后的邏輯關(guān)系,這里表轉(zhuǎn)折且有逗號(hào),故填However.
82.rivers  考查名詞.根據(jù)句意,這里表示那些住在河邊的大城市和工廠經(jīng)常會(huì)制造一些問題,河流不止一條,故填rivers.
83.in  考查介詞的固定搭配.表示"在某方面的增長(zhǎng)"要用grow/increase in,同時(shí)根據(jù)后文的 increase in number可知,這里要填介詞in.
84.polluted  考查動(dòng)詞的時(shí)態(tài)語態(tài).根據(jù)常識(shí),河流是被污染,表被動(dòng),謂語動(dòng)詞要用be/become done的形式,故填polluted.
85.natural  考查形容詞的用法.用來修飾名詞resources,要用形容詞形式,故填natural.

點(diǎn)評(píng) 非謂語動(dòng)詞中,只有to do不定式可以用來做目的狀語

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