问题 多选题

电动机的电枢阻值为R,电动机正常工作时,两端的电压为U,通过的电流为I,工作时间为t,下列说法中正确的是[ ]

A.电动机消耗的电能为UIt

B.电动机消耗的电能为I2Rt

C.电动机线圈产生的热量为I2Rt

D.电动机线圈产生的热量为U2t/R

答案

AC

阅读理解

It's over three years since I began to learn English. I am glad that I am getting on well with it.  I find English very interesting, but quite difficult. When I first started, I thought I had only to remember the new words and learn some grammar. I know little about English idioms(习语). I thought each English word had a word with the same meaning in Chinese. When I learned to say "I see a book on the desk", I thought the English word "see" was just like the Chinese word "kan". So one day when my teacher asked me, "What are you doing?" I answered, "I'm seeing a book." "That's wrong," the teacher said. "You don't see a book. You read a book. You can't use an English word like a Chinese one. Be sure not to make the same mistake again." 

After that I began to pay more attention to the differences between Chinese and English. For example, in English we say a "high mountain", but a "tall man". In Chinese we use the same word "gao" for both. Again in English we say "take part in the sports meeting", "attend a meeting" and "join the army", while in Chinese we can use "can jia" for all the three. It's interesting, isn't it? So to study English doesn't only mean hard work, it can be great fun, too! We not only have to pay attention to pronunciation, grammar, spelling and handwriting, we also have to understand English idioms. We can learn English well only in that way!

But all this is only a beginning and I still have a long way to go. I'll try my best and work even harder than before. I must speak and listen to English more both in and out of class. I must read and write more, too. I must learn English well so that I can work well when I grow up. 

小题1:When I first started learning English, I thought __________.

A.I couldn’t learn it well because it is quite difficult

B.I could learn it well if I had remembered the new words and learned some grammar

C.English is interesting and easy to learn

D.each English word couldn't find a Chinese word with the same meaning小题2:Which of the following statements is NOT TRUE according to the text?

A.To understand English idioms is a useful way to learn English.

B.To pay attention to pronunciation and grammar helps us learn English well.

C.To read and write more is helpful in learning English.

D.To study English only means working hard.小题3:Which is the best topic of the passage? 

A.How to study English well

B.The importance of English

C.English idioms

D.Do more reading

单项选择题