在圆O：x2+y2=4上任取一点P，过点P作y轴的垂线段PD，D为垂足，当点P在

计划生育率

根据对话内容及上下文，在空白处填入适当的词，使对话意思完整。每空只填一词。

  (Tom-T  Lin Tao-L  Miss Yang-M)

T: Good afteroon!

L:  Good afternoon !

M: Good afternoon ! May I _  1  _ you?

T:_  2     you     3    a book on Chinese history?

M: Let me see. Ah, here it is.

T: Thank you. How     4     you, Lin Tao?

L: Oh, I want to _  5    a book on football.

M: Oh, you're lucky. We've just got a new book on football. I think you'll be    6    with it.

L: Thank you very much!

T: How long may I     7      the book?

M: Two weeks.

L: Can I keep it a little longer?

M: Yes, you can. But you'll have to come and renew (续借) it if you     8    finish it in time.

T: Must I_  9    the book back for that?

M: Yes, you must. And you mustn't lend it  to    10     .

T: All right, we won't.

作为定案根据的证据应当具有的基本特征是（）。

A．属于物品或痕迹

B．由当事人提供

C．经过鉴定

D．具有证明力和证据能力

建筑高度不超过24m的病房楼、旅馆等建筑应设（）楼梯间。

A、开敞楼梯间

B、敞开楼梯间

C、封闭楼梯间

D、防烟楼梯间

患者，男，45岁。平素肩背酸痛，夜卧复受风邪，左臂疼痛，屈伸不利，舌脉如常。用药宜首选（）

A.羌活、独活

B.羌活、防风

C.羌活、麻黄

D.羌活、川芎

E.羌活、秦艽