题目内容

【题目】联社报道:美国东部时间2005年9月7 13时40分西五区时间,包括美国在内的地球朝向太阳一面的所有地区,高频无线电通讯几乎全部中断。据此回答3~4

【1】造成这一现象的主要原因是

A.地球大气层中的臭氧层空洞扩大使太阳辐射增强

B.太阳耀斑爆发引起地球大气层的电离层扰动

C.太阳黑子增多造成地球磁场紊乱

D.太阳等天体对地球引力加强

【2】此时地球朝向太阳一面的所有地区占全球

A一半 B一大半 C无法计算 D. 小于二分之一

【答案】

【1】B

【2】A

【解析】

试题分析:

【1】据材料可知,高频无线电通讯几乎全部中断,说明是受太阳活动类型中太阳耀斑影响的结果,故B项正确,C项错误;臭氧层空洞会导致到达地面的紫外线增多,故A项错误;太阳的引力在短期内不发生变化,故D项错误。

【2】地球为一个球体,在太阳辐射的照射下,总会有一半朝向太阳,另一半背对太阳,故此时地球朝向太阳一面的所有地区占全球一半,故A项正确,B、C、D项错误。

表现

形式

概念

表现

平均

周期

黑子

太阳表层温度较低的大气区域,看上去颜色暗一些,故称黑子

黑子的大小和多少,反映了太阳活动的强弱。一般黑子愈大、愈多,太阳活动越强

11年

耀斑

太阳黑子活动的区域突然连在一起,释放出大量的能量,这种能量把太阳上相应区域的气体加热到上百万摄氏度,会突然猛烈爆发并有增亮的现象

耀斑的出现与黑子的多少呈正相关,它总是以瞬时爆发为特征

太阳风

太阳表面向外抛出的高能带电粒子流

耀斑爆发后,太阳风的强度迅速增大

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【题目】阅读下面短文,从短文后各题所给的A、B、C和D四个选项中,选出可以填入空白处的最佳选项。

Every December the radio station in my city makes a program in which all the poor children can send letters asking for some Christmas presents. One day, as I was the radio, I decided to do something, so I asked four of my friends to help a poor child. They .

After several days, we learned about a from a little child called Juan. In his letter, he some blankets and some clothes and also wanted somebody to help his father the house because it was in bad .

We told the radio station that we wanted to Juan. After that, we started to think about how to all the money to buy all that Juan . After 5 days, we collected much money and bought many things for Juan. We bought some toys as a little for Juan.

, on December 22 the radio station gave a party in which all the children who asked for help were , and all those helping these children.

In the party, we Juan. We played some games with him and gave him the we prepared for him. He was very excited and happy, so were my and I.

That day was one of the most days in my life, and I learned something from it. Giving help to those in need is one of the most meaningful things that you can do this makes you feel good and also makes the persons who you are helping .

I am going to keep doing that all my life!

【1】A.thinking of B.listening to C.searching for D.looking after

2A.agreed B.refused C.hesitated D.admitted

3A.note B.telephone C.message D.letter

4A.asked for B.cared about C.looked at D.laughed at

5A.build B.repair C.rent D.buy

6A.choice B.situation C.condition D.place

7A.praise B.visit C.help D.teach

8A.save B.collect C.spend D.keep

9A.lost B.hated C.needed D.wasted

【10A.hardly B.also C.never D.still

【11A.surprise B.change C.promise D.comfort

【12A.Nearly B.Suddenly C.Immediately D.Finally

【13A.told B.shown C.invited D.allowed

【14A.forgot B.met C.ignored D.caught

【15A.presents B.signals C.plans D.tips

【16A.parents B.neighbors C.friends D.classmates

【17A.difficult B.official C.peaceful D.meaningful

【18A.lucky B.funny C.important D.interesting

【19A.though B.but C.unless D.because

20A.happy B.angry C.peaceful D.wealthy

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