1990年，某城市有麻疹暴发流行。经调查发现，此时期有大量的流动_爱下问搜题

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问题单项选择题 A2型题

1990年，某城市有麻疹暴发流行。经调查发现，此时期有大量的流动儿童迁入。从人群易感性角度考虑，这主要是因为（）

A.免疫人口减少

B.免疫力自然消退

C.易感人群迁入

D.隐性感染减少

E.儿童比例增加

答案

参考答案：C

解析：易感人群的迁入提高了该地区易感人群的易感性。

阅读理解

Problems	Advice
1 Whatever I do, I always think about whether other people will be happy. How can I stop worrying about what they think? -- Eva, 14, Illinois	Dr. Molly's Answer 1 You should tell him about your dream and that if you work really hard, it might come true even though you start late.
2 What should I do if I had a test? I'm afraid to tell my mom because she might get angry with me and I can't play soccer, And soccer is like the world to me. -- Ashley, 12, Wisconsin	Dr. Molly's Answer 2 You'd better tell you mom the truth than for her to find out another way. When you tell her, explain why you failed the test. Ask her if she can help with your study in the future, you'll do better in your tests and may also have time to play soccer you love.
3 My dream is to be a famous basketball player like Yao Ming. My dad thinks I started too late and I'll never be able to make it. He puts me down, but I want his support(支持). What should I do？ -- Tim, 9, Texas	Dr. Molly's Answer 3 Just be yourself and try not to care about what others think. The more you think about it, the worse you will feel. Always be strong and confident(自信).

小题1:Tim's dad doesn't support him because he thinks he ______.

A．is a litte shy and can't do it well	B．didn't start at a very early age
C．is too young to do it well	D．doesn't work hard

小题2:According to Dr. Molly, Eva should ______.

A．hold on to her dream	B．always to tell the truth
C．be brave to say hello to others	D．be confident of herself

小题3:What is wrong with Ashley?

A．She failed her test.	B．She is afraid of her mother.
C．She can't play soccer.	D．Her mother was angry with her.

小题4:Which is the correct order of Dr. Molly's answers to the three problems?

小题5:Which of the following is NOT true?

A．Dr Molly thinks Eve should believe in herself.

B．Ashley likes playing football very much.

C．Tim's dad wants him to be a famous basketball player.

D．Ashley's mother might be angry with her because of her test.

判断题

井下采掘工作面空气温度超过30℃时，必须停止作业。