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标题: 四级练习2014.09.14 [打印本页]

作者: Rebecca949    时间: 2014-9-16 10:54     标题: 四级练习2014.09.14

[audio]http://sound.yywz123.com/tingbbs/cet4/cet420140914.mp3[/audio]



M:  I've just found the most useful device at that new outdoor store,a water purifier.
W:  A water purifier?(1)_______________________.
M:  If it's lightweight and saves work,yes.And this one fits that description.
W:  Really.I bet it takes up a lot of room.
M:  Not at all.It's a straw,much like the ones you use to drink a soda or milk shake.
W:  Really? That is small?
M:  Yeah, (2)_______________________.
W:  Yes,but how good a job can it do filtering the germs out of motionless pond water,or water from lakes and streams?
M:  It's fantastic. It makes the water entirely germ free.
W:  But what about salt or chemical pollutants that might be in the water?Does it clean those out?
M:  No,(3)_______________________.
W:  Hmm,how long will a straw last?
M:  For about one hundred gallons but don't worry about measuring that large amount of water.There is a built-in safety feature.
W:  I think I'll get one for my camping trip this weekend.It'll sure be carrying a lot of water or having to boil it at the camp site.




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