四级练习2011.12.05
[audio]http://sound.yywz123.com/tingbbs/cet4/cet420111205.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.
**** Hidden Message ***** thanks 1q23321 1)You want to carry even more equipment with you on a hiking trip
2)it's prostick and has serious mineral and chemical filters that stream harmful dreams from water
3)it does not remove saltern chemicals ,but also really not major concerns we are hiking new champion
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