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患儿男性，6月龄，胎龄37周，顺产，因近日夜间多汗、易惊、持续哭闹就诊。辅助检查：胸部X线平片检查正常，血清25-（OH）D3降低，血清钙下降，枕秃明显（图1），临床诊断佝偻病（早期）。

发生佝偻病的患儿，体内缺乏的维生素是（）

A.维生素A

B.维生素K

C.维生素D

D.维生素C

E.维生素B

F.维生素E缺乏

答案

参考答案：C

选择题

读下面楼层高度与市中心距离关系示意图，回答1～2题。

1．影响楼层高度的主导因素是

[      ]

A．环境质量

B．交通条件

C．地租高低

D．建筑技术

2．在O区形成的城市功能区一般是

[      ]

A．工业区

B．中心商务区

C．住宅区

D．文化区
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单项选择题

Passage Two


Children start out as natural scientists, eager to look into the world around them. Helping them enjoy science can be easy ;there’s no need for a lot of scientific terms or expensive lab equipment. You only have to share your children’s curiosity. Firstly,listen to their questions. I once visited a classroom of seven-year-olds to talk about science as a job. The children asked me" textbook questions" about schooling, salary and whether I liked my job. When I finished answering, we sat facing one another in silence. Finally I said, "Now that we’ve finished with your lists, do you have questions of your own about science"
After a long pause ,a boy raised his hand," Have you ever seen a grasshopper(蚱蜢) eat When I try eating leaves like that, I get a stomachache. Why"
This began a set of questions that lasted nearly two hours.
Secondly, give them time to think. Studies over the past 30 years have shown that, after asking a question, adults typically wait only one second or less tor an answer, no time for a child to think. When adults increase their" wait time" to three seconds or more, children give more logical, complete and creative answers.
Thirdly, watch your language. Once you have a child involved in a science discussion, don’t jump in with" That’s right" or" Very good". These words work well when it comes to encouraging good behavior. But in talking about science, quick praise can signal that discussion is over. Instead, keep things going by saying" That’s interesting" or" I’d never thought of it that way- before", or coming up with more questions or ideas.
Never push a child to" Think". It doesn’t make sense, children are always thinking, without your telling them to. What’s more, this can turn a conversation into a performance. The child will try to find the answer you want, in as few words as possible, so that he will be a smaller target for your disagreement.
Lastly, show;don’t tell. Real-life impressions of nature are far more impressive than any lesson children can learn from a book or a television program. Let children look at their fingertips through a magnifying glass, and they’ll understand why you want them to wash before dinner. Rather than saying that water evaporates, set a pot of water to boil and let them watch the water level drop.

In which of the following paragraph (s) does the author tell us what to say to encourage children in a science discussion

A．The second and third.

B．The fourth and fifth.

C．The fifth and sixth.

D．The sevent
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