问题 选择题

用括号内试剂除去下列各物质中的少量杂质,正确的是

A.溴苯中的溴(氯化钾溶液)

B.溴乙烷中的乙醇(H2O)

C.SO2中混有CO2(澄清石灰水)

D.乙醇中的乙酸(NaOH溶液)

答案

A项应选择NaOH溶液除去溴苯中溴。C项SO2、CO2均与澄清石灰水反应,产生白色沉淀,故此法不合适。D项乙醇中含有乙酸杂质,需在加入NaOH溶液后再进行一次蒸馏方能将乙酸除去。故A、C、D的除杂方法都是不正确的,答案选B。

阅读理解

I'm fat. I'm too skinny. I'd be happy if I were taller, shorter, had curly hair, straight hair, a smaller nose, bigger muscles, longer legs. Do any of these statements sound familiar? Do you often put yourself down? If so, you're not alone. As a teen, you're going through a ton of changes in your body. And as your body changes, so does your image (形象) of yourself. Lots of people have trouble getting used to it and this can affect their confidence.

Some people think they need to change how they look or act to feel good about themselves. But actually all you need to do is change the way you see your body and how you think about yourself.

The first thing to do is recognize that your body is your own, no matter what shape, size, or color it comes in. If you're very worried about your weight or size, go to your doctor to check that things are OK. But it's no one's business but your own what your body is like-finally, you have to be happy with yourself.Next, find which aspects of your appearance you can change and which you can't change and need to accept-like their height, for example, or their shoe size.

If there are things about yourself that you want to change and can do this by making goals for yourself. For example, if you want to get fit, make a pan to exercise every day and eat nutritious foods.

When you hear negative comments coming from within yourself, tell yourself to stop. Try building your confidence by listing three things in your day that really gave you pleasure. It can be anything like the way the sun felt on your face, the sound of your favorite band, or the way someone laughed at your jokes.

小题1:. From the first paragraph, we can infer that _________.

A.most teens like to have a special body image

B.many teens can't accept their body change easily

C.teens prefer to change their body image quickly

D.teens usually change their opinions on their body image小题2:. Which of the following does the author probably agree with?

A.Realize you can't change everything about yourself.

B.Change the way other people look at you.

C.Go to your doctor for advice on how to change your body.

D.Learn from some celebrities on how to change your body.小题3:. The underlined phrase "put yourself down" in the first paragraph probably means_____.

A.make yourself fall down

B.say negative things about yourself

C.force yourself to do something

D.write down your name somewhere小题4:. The passage is mainly about_______.

A.how to adjust to the changes of your body

B.how to build confidence by changing your body

C.how to keep an attractive body image

D.how to find pleasure in your day

单项选择题