问题 问答题 简答题

太阳活动对地球有哪些影响?

答案

参考答案:

⑴对地球气候产生影响,许多地区降水量的年际变化与黑子11年的周期具有一定的相关性。

⑵对地球电离层产生影响,耀斑爆发时发射的电磁波进入地球电离层,干扰无线电短波信号,导致通讯衰减或中断。

⑶对地球磁场产生影响,太阳大气抛出的带电粒子流使地球磁场受到扰动,产生“磁暴”现象,磁针不能正确指示方向。

(4)两极的极光:日冕层的高速带电粒子流被地球磁场捕获,在两极形成瑰丽的极光。

(5)与许多自然灾害具有相关性,如地震、水旱灾害等。

阅读理解

阅读短文,选择正确答案。

      Mr.Van had a week's holiday, so he thought, "I'm going to the country by train." He put on his beautiful

clothes, took a small bag, then went to the station and got into the train. He had a beautiful hat, and he often put

his head out of the window during the trip and looked at the mountains. But the wind took his hat off.

      Mr.Van quickly took his small bag and threw that out of the window, too. The other people in the carriage

(车厢) laughed. "Is your bag going to bring your beautiful hat back?" they asked. 

      "No," Mr.Van answered, "but there is no name and no address in my hat, and there's name and an address

on the bag. Someone is going to find both of them near each other, and he's going to send me the bag and hat."

1. Mr.Van had a week's holiday and ________. [ ]

A. he was going to the city.

B. he was going to the train station.

C. he was going to the carriage.

D. he was going to the country by train.

2. When he was on the train, he ________. [ ]

A. often put his clothes out of the window.

B. often put his head out of the window.

C. often put his hand out of the window.

D. often put his bag out of the window.

3. Why did the other people in the carriage laugh? Because ________. [ ]

A. they thought Mr.Van did a good thing.

B. they were very happy.

C. they thought Mr.Van did a foolish thing.

D. they thought Mr.Van was very clever.

4. Mr.Van thought ________. [ ]

A. his small bag would bring his beautiful hat back.

B. he was lucky.

C. he was a great man.

D. someone was going to find his hat and bag and would send them back to him together.

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