问题
选择题
有含盐率8%的食盐水600克，如果要使它成为含盐率为15%的食盐水，应蒸发掉（ ）克水．
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答案
600×8%÷15%，
=48÷15%，
=320（克）；
600-320=280（克）；
答：应蒸发掉280克的水．
故选：A．
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有含盐率8%的食盐水600克，如果要使它成为含盐率为15%的食盐水，应蒸发掉（ ）克水．
|
600×8%÷15%，
=48÷15%，
=320（克）；
600-320=280（克）；
答：应蒸发掉280克的水．
故选：A．
In Australia, different people have different ways to enjoy themselves. They also have their own ideas about 1 to pass time. 2 children, about 80%, work hard in school because they have to take lots of exams. After school, they don’t want to stay at home reading books any more. 3 , they put aside their school bags and go out to play. Some old people 4 early in the morning. Then they go to park to 5 . It helps them know what is happening around the world. In the evening, they would prefer to stay at home 6 rather than do anything else. Young people enjoy having 7 trip on weekends. They go to mountains to have a picnic or go to the 8 to camp. They usually start on Friday and spend one or two days outside. Then on 9 evening, they start their way back home. 10 seems to be in a hurry, although a busy week is waiting for them again.
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