问题 选择题

据报道,科学家预计2012年太阳活动将达到史无前例的高峰期。我们可以预见到那时将发生大量的太阳活动。据此完成题。

小题1:如果2011~2012年是太阳活动强烈的时段,那么上一个活动强烈时段约是(  )

A.2000~2001年

B.2006~2007年

C.2022~2023年

D.2087~2088年小题2:本次太阳活动所产生的带电粒子流到达地球后,对地球可能造成的影响有(  )

①地球出现极光现象        ②地球磁针不能正确指示方向

③流星现象增多           ④我国北方会出现极昼现象

A.③④

B.①③

C.①②

D.②③

答案

小题1:A

小题2:C

题目分析:

小题1:太阳活动的周期为11年,2011~2012年是太阳活动强烈的时段,由此向前推11年,则上一个活动强烈时段约是2000~2001年。

小题2:太阳活动所产生的带电粒子流会引起电离层的扰动,进而影响无线电短波通信;太阳活动会影响地球磁场,发生磁暴、极光现象,太阳活动强烈时地球磁针不能正确指示方向,太阳活动还会引起地球气候发生异常。

点评:本题难度较小,小题1考查太阳活动的周期,小题2考查太阳活动对地球的影响,属于对基础知识的考查,同时也考查了学生对基础知识的运用能力。太阳活动对地球的影响:

 

太阳活动对地球的影响

影响典例防御
影响地球气候亚寒带树木的年轮有规律的疏密变化与黑子11年的活动周期相对应;黑子活动高峰年,气候反常的几率增多,黑子活动的低峰年,气候状况相对平稳。世界各国和我国都十分重视对太阳活动的观测和预测,力图把太阳活动可能造成的不利影响降到最低程度。
扰乱地球电离层人阳活动增强时发出的电磁辐射和高能带电粒子流,强烈干扰地球高空的电离层,影响无线电短波通信,甚至会使各类无线电通信产生短时间的中断现象。
干扰地 球磁场当太阳活动增强时,来自太阳的高能带电粒子流,会干扰地球磁场,产生磁针剧烈震动而不能正确指示方向的“磁暴”现象。
产生极光高能带电粒子高速冲进两极地区的高空大气,并与那里的稀薄大气相互碰撞会产生淡绿色、红色或粉红色的光带或光弧,叫极光。
自然灾害地球上许多自然灾害的发生与太阳活动有关,如水旱灾害等。

阅读理解

阅读短文,选择正确答案。

    To start as a volunteer (志愿者), you could look for an organization (机构) or activity in your area. Some

volunteers sign up for the Peace Corps (和平部队) or other organizations and travel to faraway parts of the

world. But you already have things to do at home. So maybe you should start with a small project.

    Meng Chen is a student in Beijing. He goes to the Forbidden City almost every day. The 20-year-old

volunteers there. He tells visitors about the clocks in the clock gallery (钟表馆).

    Meng is one of around 300 volunteer tour guides in the Forbidden City. One-third of them are university

students. They hang around the palace like other visitors, but with red "volunteer" cards on their clothes.

    Meng said he loves spending time in the buildings where 25 emperors (皇帝) spent their whole lives.

"Every brick has a story to tell," he said.

    But volunteer work is more than fun. Meng has to study for the job. It took him about three months to

remember every detail (细节) of the 176 clocks in the clock gallery.

    And it can be frustrating. (让人泄气的) Often, tourists turn down volunteering guides. "Too many people are

in a rush to finish sightseeing. They don't have time to listen to us," said Shi Hui. He is a university student who

volunteers there.On his first day, Shi walked around for three hours until he found a man in his 50s who was

happy to listen to him.

    "It's always fun to have listeners who are interested in your talk," Shi said.

1. How often does Meng Chen volunteer in the Forbidden City? [ ]

A. Once a month.

B. Almost every day.

C. Twice a week.

D. Almost every weekend.

2. What does Meng Chen do at the clock gallery? [    ]

A. He watches the clocks.

B. He repairs broken clocks.

C. He works at a tour guide.

D. He collects visitors' tickets.

3. We can tell from the story that Meng Chen ______. [ ]

A. enjoys being a volunteer

B. is tired of volunteering

C. is shy and seriou

D. will become a tour guide after graduation

4. Volunteers working in the Forbidden City can be frustrated when _____. [ ]

A. they are not paid enough money

B. people refuse to listen to them

C. they have too much work to do

D. they have to travel far to the Forbidden City

5. The passage is mainly about _____. [ ]

A. where to find volunteer work

B. how to become a volunteer

C. things to pay attention to as a volunteer

D. experiences of some volunteer

多项选择题