问题 问答题 简答题

用电饭锅做饭时,发现锅里的饭已经熟了,而跟电饭锅相连的导线却不怎么热,为什么?(电炉子通电后,热的发红,而跟其相连的导线却不怎么热,为什么?)

答案

参考答案:

导线与电饭锅是串联的,通过它们的电流是相等的,但是导线的电阻远远小于电饭锅发热体的电阻,由公式P=I/R可知,电阻越大热效率越高,反之热效率越低,相同时间内产生的电热少,温度低,所以电饭锅热得将饭煮熟了,而导线却不怎么热。

阅读理解

任务型阅读

Do you like chocolate? Maybe most people do. A box of it can be a great gift. Buy one for a friend and give it as a surprise. See how happy that person gets.

Say you’ve just got a box of chocolate. Which piece would you pick first? A man has studied people’s choices(选择). He says they tell something about the person. What if you choose a round piece? You are a person who likes to go to the party. What if you choose an oval(椭圆形的)shape? (1)You are a person who likes to make things. Picking a square shape shows something else: The person is honest and truthful, and you can depend on(依靠)him or her.

(2)What kind of ________do you_______? Maybe you pick milk chocolate. This shows you have warm feelings about the past. Dark chocolate means something else. A person who chooses it looks toward the future. What about white chocolate? Would you choose it? If so, you may find it hard to make up your mind. Some people like chocolate with nuts(果仁). These are people who like to help others.

Different choices may show different characters(性格). Do you believe these ideas? Can candy tell all these things? It doesn’t really matter. There is one sure thing about eaters of chocolate. They eat it because they like it.

小题1:将(1)句译成中文:_____________________________________________________________

小题2:在(2)句的空白处填入适当的词使句意完整、上下文通顺:_________ _________

小题3:回答问题:What may you like to think of if you enjoy eating milk chocolate?

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小题4:在文中找出与You enjoy taking part in parties.意思相近的句子:

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小题5:在文中找出最能表达该短文主题的句子:

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单项选择题