显微镜构造的两大部分是（）。 A.光学系统和机械系统 B.接物镜和接目镜 C.高倍镜

阅读理解。

     Mr and Mrs Jones were going on their vacation (假期) with their children, and they must arrive at the

airport before 11:40 the next morning."It takes us thirty minutes to get there in a car," Mr Jones said," so

we must get ready before eleven o'clock. Don't be late."

     At ten-fifty, all of them were busy doing something, but Mrs Jones wasn't. She sat quietly in a chair in the

garden and enjoyed the good weather.

     Mr Jones and the children were surprised, but Mrs Jones said,"Don't worry! Before I went to bed last

night, I made all our clocks and watches twenty minutes ahead (提前). Now we can get to the airport early."

1. Why did the Jones family have to be ready before eleven o'clock?

A. Because they were going to a party.

B. Because they must arrive at the airport at 11:40.

C. Because they had to go to a town.

2. How long does it take to go from Mr Jones' house to the airport by car?

A. Twenty minutes.

B. Thirty minutes.

C. Fifty minutes.

3. Mr Jones and the children were ______ when they saw Mrs Jones sitting in the garden.

A. sad

B. happy

C. surprised

4. Why did Mrs Jones sit quietly?

A. Because she made all the clocks and watches ahead and they wouldn't be late.

B. Because she didn't like to spend her vacation.

C. Because she wanted to stay at home.

5. What time was it in fact (事实上) when Mr Jones and the children were busy doing things?

A. It was ten-fifty.

B. It was eleven-ten.

C. It was ten-thirty.

建设创新型国家的核心是增强( )。

A．科学发现能力

B．技术发明能力

C．模仿创新能力

D．自主创新能力

一种外表类似苹果的水果被培育出来，我们称它为皮果。皮果皮里面会包含少量杀虫剂的残余物。然而，专家建议我们吃皮果之前不应该剥皮，因为这种皮果的果皮里面含有一种特殊的维生素，这种维生素在其他水果里面含量很少，对人体健康很有益处，弃之可惜。 以下哪项，如果为真。最能对专家的上述建议构成质疑( )

A．皮果皮上的杀虫剂残余物不能被洗掉

B．皮果皮中的那种维生素不能被人体充分消化吸收

C．吸收皮果皮上的杀虫剂残余物对人体的危害超过了吸收皮果皮中的维生素对人体的益处

D．皮果皮上杀虫剂残余物的数量太少，不会对人体带来危害

管道全塑电缆敷设时，为避免潮气浸入电缆，布放时，凡剪断的电缆端头应及时封闭严密，保证电缆气压。（）

A.对

B.错

“三违”根据其可能造成的危害和后果，以及“三违”的情节，分为（）“三违”和（）“三违”两种。