问题 填空题

电磁炉是利用电磁感应原理,使金属锅体在不断变化的磁场中产生感应电流,感应电流在金属锅体内的闭合回路中流动,这是利用了电流的 ______(选填“化学效应”、“磁效应”或“热效应”)来加热金属锅体,从而烹饪食物.其中食物从金属锅体上是通过 ______方式获得内能的.

答案

根据电磁炉电磁感应原理,使金属锅底产生感应电流,是利用了电流的磁效应,金属锅底发热后,食物从锅体上通过热传递来获得热量.

故答案是:磁效应;热传递.

问答题
阅读理解

阅读理解。

     Your voice is the only means of communicating over the telephone. Even so, watch your body language

and facial expressions-they affect the way you sound. If you are sleepy, for example, you often will sound

tired or breathless. To keep a healthy and bright tone (音调) in your voice, smile when talking on a phone.

     Don't answer the phone in a rush. Take a deep breath, and then breathe out slowly as you pick up the

receiver. You will sound more relaxed. If you recognize the other person' s voice, use his/her name on your

greeting. Use it again during the conversation and when parting. When making a difficult call, work out exactly what you wish to say. Stand while making the call-it will help you sound more confident.

     Get fairly quickly to the point-"The reason I' m calling is..."Try to drop the pitch (音高) of your voice at

the ends of sentences-it will help you be more sure about what you said.

     If you know somebody wants to talk a lot, make it clear at the start of the call that you have only a little

time. There are several ways of making a call short:" It ' s been lovely talking to you, but I really must go

now." or" I know you are quite busy, so I better go now."If all fails, try," My other line is ringing. Or"I think

there' s someone at the door."

     When leaving a message on someone s answering machine, speak clearly and slowly to allow the person to

take down any details as your message plays back. Many people feel uneasy with answering machines. Again,

form a picture of the other person in your mind, and you will sound more relaxed.

     With the increasing use of tele-communication and mobile phones, it has become of great importance that

we pay special attention to HOW and WHAT we speak on the phones.

1. In Paragraph 1, the author suggests paying attention to your  _____.

A. voice

B. body language

C. tone

D. health

2. What does the underlined word "it" in Paragraph 2 refer to?

A. The phone.

B. The receiver.

C. The name.

D. The greeting.

3. The author supports his idea in Paragraph 4 through _____ .

A. experiments

B. explanations

C. stories

D. examples

4.  What would be the best title for this passage?

A. Talking on a Phone

B. Keep Your Voice Sweet

C. Voice and Body Language

D. Body Language is Important