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问题 选择题

现有一瓶质量分数为20%的某溶液，倒出3/4体积后再加水，直到所得溶液质量和原来溶液的质量相等，又倒出2/3体积，最后剩下溶液中溶质的质量分数为 [ ]

A. 3%

B. 4%

C. 5%

D. 6%

答案

答案：C

多项选择题

物流作业标准能够实现作业（）以及保证作业质量的基础。

A.统一化

B.规模化

C.规范化

D.效率化

E.个性化
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单项选择题

New rules and behavior standards(行为规范) for middle school students came out in March. The Middle School is going to use a new way to decide who the top students are. The best students won’t only have high marks. They should not (染) their hair, smoke or drink because they are students. The following are some of the new rules.
Have you ever copied someone else’s work in an exam Don’t do that again! That’s not something an honest student should do.
Do more at school. Good students love animals and care for other people. April is Bird-loving Month in China. Is your school doing anything to celebrate it You should join! And you can learn more about animals and how to protect them. Be friendly to the people around you. Try to think of others, not only yourself.
Be open to new ideas. Do you think people can live on the moon7 Maybe you’ll find another earth someday. Don’t look down on new ideas. Everyone’s ideas are important. You should welcome them, because new ideas make life better for everyone.
Protect yourself. Has someone ever taken money from one of your classmates Don’t let it happen to you. If you have to go home late, you should let your parents know.
Use the Internet carefully. The Internet can be very useful for students. But some things on the Internet aren’t for children, so try to look at web pages (网页) that are good for you.

The passage mainly(主要地) tells us how to ______.

A．care for others

B．do more at school

C．be top students

D．use the Internet
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