观察黑藻叶中叶绿体的实验时，下列操作错误的是（）

题干

A：制作临时装片时，先在载玻片中央滴一滴健那绿染液

B：先在低倍镜下找到细胞，再用高倍镜观察

C：随时保持临时装片中有水状态

D：若视野比较暗，可调节反光镜和增大光圈

上一题下一题 0.0难度选择题更新时间:2019-03-04 06:16:53

A

填入一个适当的词补全对话，每空一词。

A: Hello, is that Tom speaking?

B: Hello, this is Tom.

A: Have you made a plan for this weekend?

B: Not yet. I'm____ busy to think about it. What is your idea?

A: What about playing basketball at the City Gym this Saturday?

B: Good idea. When shall we meet?

A: Let's____ it 8: 00 a.m.

B:All right.____ are we going to meet?

A: At the bus stop near our school.

B: How____ does it take to go to the gym by bus?21教育名师原创作品

A: About half an hour.

B: Why not go there by subway? The traffic may be very awful on Saturday morning.

A: I can't agree with you any____ Then we can meet at the subway station.

B: Do you know what the____ will be like that day?

A: The radio says it will be rainy.

B: ____ better take umbrellas with us.

A: OK. I think we'll have fun together. I'm looking forward to that. See you.

B: See you.