小勇晚上开灯时发现灯不亮，他用测电笔测试，如图，A，B，C三点

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问题选择题

小勇晚上开灯时发现灯不亮，他用测电笔测试，如图，A，B，C三点都能使氖管发光，只有D点氖管不发光，则可判断出故障是（　　）

A．火线和零线短路

B．灯泡断路

C．灯泡短路

D．导线CD某处断开

答案

答案：D

填空题

阅读下面的对话，根据上下文蒋空缺的内容补充完整，完成对话。每空不限填一个单词。

A :Hello, Mrs White. Come in and sit down.

B :Hello, doctor.

A : 小题1:

B :I've got a headache.

A : 小题2: you often have a headache ?

B :No, never. I've never had a headache before.

A : 小题3: have you been like this ?

B :About two or three hours ago.

A :Let me take your temperature. Oh, it's high fever. You must catch a bad cold.

B : 小题4: give me some medicine ? It's very painful.

A : Yes. I'll give you some pills, take one three times a day. You will 小题5: soon.

B :Thank you very much.

A :That's all right.

选择题

美国的佛罗里达州利用光热优势，重点生产蔬菜、花卉，供应东北部工业区，主要依赖于( )

A．交通运输条件的改善

B．市场的需求

C．政策

D．农产品的保鲜、冷藏等技术的发展