用显微镜观察洋葱鳞片叶表皮细胞临时装片时，首先用低倍物镜找到图像，再换用高倍物镜

用所给词的适当形式填空。

1. ____ (luck), modern medicine can help people with eye problems in less developed countries.

2. They _____ (plan) a trip to Disneyland at this time yesterday.

3. —Excuse me, where is the _____ (lady) Room?

    —It's over there.

4. I am _____ (excite) about passing the final exams.

5. He speaks Chinese very well, though he is a ____ (Canada).

—Look! That teacher is explaining something to her students again and again!

—_______teacher she is!

A．How patient

B．What patient

C．How a patient

D．What a patient

飞机对货物装载的限制有（）

A.重量

B.容积

C.高度

D.地板

E.舱门

漏电保护器主要用于保护人身因漏电而发生电击伤亡或防止因（）漏电引起电气火灾事故。

A.线路雷击

B.过电流

C.电气设备或线路

D.过电压