受气压梯度力和地转偏向力等因素影响，近地面形成了风带和无风带（无盛行风地带）。全球无风带的分布范围是
A．南北纬30°附近
B．南北纬40°附近
C．南北纬60°附近
D．南北纬80°附近
答案：A
风是指空气的水平运动，无风带主要是盛行上升或下沉气流的地区。南北纬40°附近受西风带或副热带高气压控制；南北纬60°附近地区主要盛行西风；南北纬80°附近地区主要盛行极地东风。
| 阅读短文，从每题所给选项中选出可以填入空白处的最佳选项。 | ||||
| Do you often think of your parents? You may say, "Of course, I __1__. I often buy presents __2__ my mother and my father on some important days." Here's a story about my friend. She works in a big city. She is very busy. So she doesn't have time __3__ her parents. But she often calls her parents. Every time, she dials (拨) the number, but then she puts down the telephone. __4__five minutes, she dials the number again. Later, I ask, "Why do you dial the number __5__ ?" She smiles, "My parents are __6__ and slow. They can't get to the telephone quickly. I always do so when I call them. I only want to give them __7__ to answer the telephone. My friend is a good girl. She is always __8__ of her parents. You also want to be a __9__ child, right? Please always remember (记住) to __10__ your parents in every situation (在各种情况), not just on some important days. | ||||
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