下列资料属等级资料的是（） A.白细胞计数（个/L） B.血型（A、B、O、A B.

用所给动词的适当形式填空。

1.—Hello! Have you _________ (see) my pen? I can't __________ (find)it．

   —I'm afraid I haven't.

2.—Excuse me. Have you _________ (see) my pen? I _________ ( put) it on the shelf a moment ago.

   —Oh, yes, I have. I'm sorry I forgot to _________ (give) it back to you.

3.—Mary, I've _________ (lose) my cap. Have you _________ (see) it anywhere?

   —Look! It's over there. I _________ (see) you put it there.

4.—Have you _________ (find) your knife yet?

   —Not yet.

5.—John, _________ you _________ (return) my pen yet?

   —Not yet. Don't worry! I _________ (return) it soon.

6.—Jim, _________ you _________ (write) a letter to your aunt?

   —Yes, I _________．

   —When _________ you _________ (write) it?

   —I _________ (write) it last week.

下列各项属于动物学习行为的是 [ ]

A．黑猩猩通过堆叠箱子摘下悬挂在高处的香蕉

B．狼将捡到的婴儿哺育成“狼孩”

C．蜘蛛结网捕捉昆虫

D．鸟类的筑巢、孵卵和育雏

工程成本控制是监督成本费用，降低工程造价的重要手段。 ( )

转录因子（TF）是（）

A.原核生物RNA聚合酶的组分

B.真核生物RNA聚合酶的组分

C.有α、β、γ等各亚基

D.转录调控中的反式作用因子

竖井罐笼最大提升速度在（）m/s以上时，必须安装限速装置。

A.8

B.6

C.4