问题 选择题

下列关于热机和环境保护的说法中正确的是(  )

A.热机的大量使用会造成环境污染

B.所有的热机都是用汽油作燃料

C.汽车排出的尾气都是有毒气体

D.热机所产生的噪声,可以被热机上的消声器完全消除

答案

A、热机都是靠燃烧燃料获得能量的,汽油、柴油等燃料燃烧时都会放出有害气体,污染环境,所以A是正确的;

B、热机中有燃烧汽油的(汽油机),有燃烧柴油的(柴油机),有燃烧液态氢的(火箭喷气发动机),所以B是错误的;

C、汽车排出的气体中有二氧化碳、水蒸气、一氧化碳、氮氢化合物等,其中二氧化碳和水蒸气是无害的,所以C是错误的;

D、消声器只是减弱噪声,而不是消除噪声,所以D是错误的.

故选A.

完形填空

The trip to that city was eye-opening for everyone, and near its end , all the young people in our group began to reflect on what it had meant. We __21__ the first night we had arrived. We had all gone into the markets of the city __22__ the young people could experience its energy. But what we actually saw simply   23 us all –the rundown houses, the children in rags, the people begging for money… Walking home,  24  under a low bridge, we came across  25  families of homeless people seeking a bit of dry ground to sleep on  26  he night. We had to step over bodies as we found our way through the darkness.

The poverty(贫困) was  27  than anything my young companions had ever imagined. Back in the hotel, an air of sadness settled over the group. Many  28  and cried. Spending time in this  29  moves a person to care about humanity.

That evening, our group spent hours talking about what we had  30  . Gently, I encouraged everyone to talk about the difficult  31  that day’s discoveries had inspired. Sitting together  32  a circle as everyone had a chance to speak, we all began to realize that  33  of us was alone in our struggle to cope with our reactions.

Based on my  34  in poverty-stricken areas, I suggested that  35  the emotions we had were painful, they could also be important in helping us to move forward. We all  36  that we had seen things that should never be allowed to happen.  37  , what could we do about it? Together, we began to brainstorm ways we could help to ease the  38  we had seen. As I encouraged group members to focus on  39  they could do, a sense of determination  40  the previous sadness. Instead of despair, these young people began to feel a call to action.

21.A.put up with       B.got back to      C.looked back on      D.made up for

22.A.now that         B.so that          C.as if              D.even if

23.A.puzzled          B.annoyed          C.embarrassed        D.shocked

24.A.marching         B.running          C.passing            D.moving

25.A.entire           B.normal          C.average            D.general

26.A.beyond           B.with             C.till                D.for

27.A.stronger         B.deeper           C.worse               D.less

28.A.gave up          B.broke down       C.set off             D.held on

29.A.environment       B.hotel             C.house               D.background

30.A.inspected         B.attempted        C.witnessed         D.challenged

31.A.feelings          B.decisions         C.thoughts          D.impressions

32.A.along            B.around           C.by                 D.in

33.A.neither           B.either            C.none             D.each

34.A.experiences       B.schedules         C.data             D.position

35.A.once             B.while            C.since             D.unless

36.A.supposed         B.advised           C.confirmed         D.agreed

37.A.Surely           B.Rather            C.Now               D.Indeed

38.A.burden           B.suffering          C.anxiety          D.difficulty

39.A.how             B.where           C.what                D.when

40.A.replaced          B.changed          C.covered          D.improved

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