补全对话(方框中有两项是多余的)

A：Hi，Betty．What are you going to do?

B：Hi，Lingling!____  

A：Oh，I have just come from there．

B：____ 

A：Yes．There will be an English speaking competition next Friday．

B:____

A: Life in the Future．

B: That's a good topic．  ____ 

A: Yes, I'd like to．I think I can practise my spoken English．What about you?

B：Oh，you know，I am shy．I am afraid I can't speak in public．

A：____ If you keep on practising，you will be successful．

B：I will think about it．Thank you very much

A．Don't worry．     B．I am going to look at the board．  C．I entered a photo competition．   D．Is there anything new?     E．Would you like to take part in it?  F．What do you want to do?     G．What is the topic?

下列句子中，没有语病的一句是

在“设计和制作一个模拟调光灯”的综合实践活动中，小明设计的电路图如图所示，已知电源电压为6V，小灯泡上标有“4.8V 0.3A”字样（4.8V是灯泡正常发光时两端的电压，0.3A是灯泡正常发光时通过的电流），滑动变阻器的规格是“20Ω 1A”． 假设小灯泡灯丝电阻固定不变，灯泡的电阻是____Ω，他正确连接电路且操作规范后闭合开关，此时电路中的电流是____A，移动滑动变阻器的滑动片，当灯泡正常发光时，滑动变阻器接入电路的阻值为____Ω，该电路不足是当滑动变阻器接入电阻过小时，会烧坏灯泡，对此你改进的措施是____ .

Here ____(be) some words.

人类每时每刻都离不开空气，通过治理，盐城市的空气质量今年来有所好转．下列有关空气的说法不正确的是（　　）