题目内容

The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is necessary in many other ways — ways that are not always so obvious or widely known. If we did not have air, there would be no sound. Sound travels through air. Where there is no air, there is no sound. Without air there would be no fire. There would be no automobiles, since motors need air in order to operate. Without air, there would be no wind or clouds. The night time would be very cold and the days very hot. We would be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun’s deadly rays. In this huge ocean of air surrounding the earth, there is more energy than in all the coal, oil and gas we have on the earth. Electrical energy is collected in the atmosphere as water is collected and stored in a dam (大坝). The existence of electricity in the air has been known for centuries. Men have gazed in wonder at the bright patterns of lightening in storm clouds. But thorough (彻底的,深入的) study of electricity in the air was not possible until the development of radio. It is not widely known that ______.

A. air is important to human being
B. air is important to the earth
C. air is necessary in many other ways
D. air is necessary to the animals

查看答案
更多问题

阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。 From Monday until Friday (36) people are busy working or studying, but in the evenings and (37) weekends they are free to enjoy themselves. Some watch TV or go to the movies; (38) take part in sports. It depends on individual (39) . There are many different ways to spend our (40) time. (41) . everyone has some kind of hobby. It may be (42) from collecting stamps to (43) model planes. Some hobbies are very (44) ; others don’t cost (45) at all. Some collections (收藏品) are (46) a lot of money; others are valuable only (47) their owners. I know a man who (48) a coin collection worth thousands of dollars. A short time ago, he got a (49) fifty cent piece by (50) $250. He was very happy about his collection and thought the price was (51) . On the contrary, my youngest brother (52) match boxes. He has almost 6,000 of them. But I (53) if they are worth any money. However, for my brother they are very (54) . Nothing makes him (55) than to find a new match box for his collection.

A. interesting
B. exciting
C. cheap
D. expensive

W: I’m free this afternoon.Shall we go see a filmM: Ok.But I won’t go unless there’s a film about war.W: I’m afraid there’s none.Then how about the theaterM: Well, most plays are badly written, though they are Very cheap.W: Let’s go to a concert. You like music very much.don’t youM: Yes, but light:music only.W: What are we going to do thenM: Why not go to the library You like reading as much as I do.W: Yes. that’s a good choice for you and me. What will they probably do this afternoon()

A. Go to the movies.
B. Go to the theatre.
C. Go to the library.

从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。 There was a heavy fog this morning, so no plane could ______ on time.

A. get through
B. take off
C. put on
D. break out

W: Can you believe that we’ve finally found a houseM: Good for you.Tell me about the house!W: It doesn’t look good outside. but it is lovely inside.M: How nice! How many bedrooms does it haveW: Well,it has three bedrooms, two bathrooms,one big sitting room and a modern kitchen.M: Then your two boys don’t need to share a room. They are happy with itW: Yeah, they can have their own rooms. What interests me most is the small garden before the house.You know I love gardening so much. What does the woman like most about the house()

A. The small garden.
B. The modern kitchen.
C. The bid sitting room.

答案查题题库