问题 选择题

下列实验设计能够成功的是[ ]

实验目的 
实验操作
A.
实验室制备硝基苯
将苯和浓硝酸混合后加热
B.除去硫酸钠溶液中少量氯化钠杂质 向含有氯化钠杂质的硫酸钠溶液中加入适
量的硝酸银溶液,过滤
C.检验溴乙烷发生消去反应的产物 向盛有少量溴乙烷的试管中,先加入氢氧
化钠溶液,再滴入用硝酸酸化的硝酸银溶液
D.浓硝酸的氧化性强于稀硝酸 向盛有少量的浓硝酸、稀硝酸的两支试管中,
分别加入大小相同的铜片
答案

答案:D

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.

According to the passage ,which of the following is true

A.Tell the truth, even when you are wrong.

B.Keep some animals to kill them.

C.Look down on new ideas.

D.Everything on the Internet is good for children.

判断题