【題目】閱讀下面短文，在空白處填入1個適當?shù)膯卧~或括號內(nèi)單詞的正確形式。

Many people living in cities see riding a bicycle as good exercise. But, a recent medical 【1】 research warned that cyclists should think twice before cycling in the streets： it actually does more harm than good 【2】 their bodies.

Is cycling in cities really bad for your health? Probably yes. The main danger comes from the air around you. Breathing 【3】 in air pollution from taxis and buses can damage blood vessels（血管）.Scientists say the damage could outweigh the health benefits of cycling.

David Newby, a British 【4】 researcher at Edinburgh University broke the news. In his tests, 15 healthy men cycled 【5】 on exercise bikes in a room with levels of air pollution similar to those found 【6】 on a crowded city street. After an hour of cycling, the scientists found their blood vessels became less flexible and produced less of a protein（蛋白質(zhì)）【7】 the heart needs. The damage leads to the early stages of heart disease. What's worse, the faster a cyclist pedals （蹬車），【8】 more air they breathe in. So those who believe 【9】 they are improving their fitness the most are storing up the biggest trouble for themselves 【10】.

【答案】

【1】medicine

【2】to

【3】breathe

【4】Britain

【5】cycle

【6】find

【7】that/which

【8】the

【9】believe

【10】they

【解析】

本文是一篇說明文。文中介紹了愛丁堡大學的一名研究人員David Newby發(fā)布的消息：在大街上騎行對身體有害！

【1】考查形容詞。句意：但是近期的一項醫(yī)學研究警告騎行者到大街上騎行之前要三思。此處為形容詞修飾名詞，medical醫(yī)學的。故填medical。

【2】考查介詞。句意：這對他們的健康造成的危害要遠遠大于好處。此處考查固定短語do good to對...有益處。故填to。

【3】考查動名詞做主語。句意：呼吸來自于出租車和公交車的污染氣體對血管會造成破壞。分析句子可知本句缺乏主語，故應用動詞的ing形式做主語。故填 breathing。

【4】考查形容詞。句意：愛丁堡大學的一名研究人員David Newby發(fā)布了這個消息。此處為形容詞修飾名詞，British英國的。故填British。

【5】考查一般過去時。句意：在他的測試中，15名健康的男性在充滿類似于擁擠的大街上發(fā)現(xiàn)的污染氣體的實驗室中騎行。這項測試已經(jīng)結(jié)束，因此應用一般過去時。故填 cycled。

【6】考查過去分詞作定語。句意：在他的測試中，15名健康的男性在充滿類似于擁擠的大街上發(fā)現(xiàn)的污染氣體的實驗室中騎行。此處air與find構(gòu)成動賓關(guān)系，故應用過去分詞形式作定語，表“被動”。故填found。

【7】考查定語從句。句意：他們的血管變得不那么有彈性，并且一種心臟所需要的蛋白質(zhì)的數(shù)量也減少了。根據(jù)句意可知此處為定語從句修飾先行詞a protein，且從句中缺主語，因此應用which/that。故填that/which。

【8】考查冠詞。句意：騎行者蹬車越快，吸入的氣體越多。本句考查固定句式：the +比較級，the +比較級，越...., 就越。故填the。

【9】考查一般現(xiàn)在時。句意：因此，那些相信他們正在改善身體健康狀況的人其實正在為他們自己貯存最大的麻煩。本句講述現(xiàn)在的狀況，因此應用一般現(xiàn)在時。故填believe。

【10】考查代詞。句意：因此，那些相信他們正在改善身體健康狀況的人其實正在為他們自己貯存最大的麻煩。根據(jù)句意可知應用反身代詞。故填themselves。

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