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【Theworldisnotonlyhungry,anditwillalsobethirstyforwater.About97%ofthewaterontheearthisseawater,orsaltwater.Mancanonlydrinkorusetheother3%ofthefreshwaterwhich(37)___(come)fromrivers,lakesandun】
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问题描述:

The world is not only hungry,and it will also be thirsty for water.About 97% of the water on the earth is sea water,or salt water.Man can only drink or use the other 3% of the fresh water which (37)___(come) from rivers,lakes and underground.On the other hand.Because the number of people in the world (38)___(become) larger and larger,more and more fresh water (39)___(need).So water shortage(短缺) becomes a big problem.

How can we work out the problem?Scientists (40)___(find) some ways to turn salt water into fresh water.One important way is(41)___(boil) sea water with high heat until vapor rises,leaving the salt.In this way,a lot of fresh water can be made quickly.

But heating is not the only way to get fresh water.We hope scientists (42)___(try) other ways to get the freshest water for the least money as soon as possible.

梅晓榕回答:
  37.comes考查定语从句的主谓一致.分析句子可知是which引导的定语从句,先行词是water,是不可数名词,且时态是一般现在时,所以谓语动词要用三单形式,填comes即可.   38.isbecoming考查时态.结合语境可知此处表示因为世界人口的数量正变得越来越庞大,数量变得庞大是正在进行的动作,要用现在进行时,即be+动词的现在分词.people前有thenumberof修饰,谓语动词要用单数形式,所以此题填be动词的三单形式is,再加上become的现在分词即可.   39.isneeded考查语态.结合语境可知此处表示越来越多的水被需要,water与need间是动宾关系,当water作主语时,要用被动语态,即be+及物动词的过去分词.此处时态是一般现在时,主语water是不可数名词,谓语动词要用三单形式,即be动词填三单形式is,再加上need的过去分词即可.   40.havefound考查时态.由下文的Oneimportantwayis(41)(boil)seawaterwithhighheatuntilvaporrises,leavingthesalt可知科学家们是已经发现了一些方法来使盐水转换为淡水,要用现在完成时,表示动作已经完成,主语scientists是复数,所以填have+动词过去分词即可.此题填have加上find的过去分词.   41.toboil考查不定式.分析句子可知空格处做句子的表语,且boil是动词,动词的不定式形式可以作表语,此处表示一个重要的方法就是用高温将盐水煮沸,直到水蒸气上升,并析出盐.   42.willtry考查时态.由hope可知hope后的从句表示一种希望,是还没有发生的动作,要用一般将来时,填will加上try的原形即可.
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