题目内容

【题目】2015年10月12日至18日,国家天文台在日面上观测到多次黑子和耀斑活动。据此完成下列问题。

【1】有关太阳活动的正确叙述是

A.太阳活动是太阳内部的变化

B.黑子和耀斑的活动周期约为11年

C.耀斑出现在太阳光球层

D.黑子是色球层上出现的暗黑的斑点

【2】太阳活动剧烈时,对地球产生的影响可能是

A.干扰地球磁场引发磁暴现象

B.地面无线电长波通信受到影响

C.全球各地降水量都明显增多

D.两极地区产生极昼极夜现象

【答案】

【1】B

【2】A

【解析】

试题分析:

【1】太阳活动是地球外部大气层释放能量的不稳定导致的,A错。耀斑和黑子活动周期为11年,B对。耀斑发生在色球层上,C错。黑子是光球层上黑色的斑点,D错。故选B。

【2】太阳活动剧烈时,会干扰地球磁场引发磁暴现象,A对。太阳活动导致电离层扰动,地面无线电短波通信受到影响,B错。会对地球气候有影响,不一定降水量增多,C错。两极地区出现极昼极夜现象与地球公转有关,与太阳活动无关,D错。故选A。

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【题目】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Every living thing has genes. Genes carry information. 【1】 They make sure that humans give birth to humans and cows give birth to cows. However, genetic engineers take genes from one speciesfor example, a snake, and transfer them to anotherfor example,corn. 【2】 Such new life forms have been described as a real-life Frankenstein.

Genetic engineers put duck genes into chicken to make the chickens bigger.They put genes from flowers into beans and from fish into tomatoes. 【3】 It just makes them easier and faster for the farmer to grow.

The effects of genetic engineering on the natural world may be disastrous.The engineers may create strange life beings,or monsters.that we cannot contro1. 【4】 They11have to find one,fight for oneor kill for one.It may be your land they fight foror you that they kill.

We would all like a better,healthier and longer life,and genetic engineering might give us this.On the other hand,it may be a dangerous experiment with nature.In the story of Frankenstein,the doctor created such a terrible and dangerous monster that he had to destroy it. 【5】

A.In this way a new life form is created.

B.Then they feed the tomatoes to the fish.

C.This doesnt make them cheaper, tastier, or healthier.

D.The new life forms have no natural habitat or home.

E.They are passed on from generation to generation.

F.The information tells us what to do or what not to do.

G.We must make sure that this tale remains a storyand no more than that.

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