题目内容

【题目】太阳活动爆发被人们形象地称为“太阳发脾气”,人们也一直在研究“太阳发脾气”时地球上发生的变化,但仍有很多领域的问题难以解决。据此回答下面小题。
(1)“太阳发脾气”时可能导致( )
①手机用户通话时信号时强时弱
②信鸽迷途
③地球各地出现极光现象
④地球高层大气高速散逸到星际空间
A.①②
B.②③
C.③④
D.②④
(2)到下列哪个国家旅行有可能欣赏到因“太阳发脾气”而形成的空中梦幻景观( )
A.加拿大
B.英国
C.意大利
D.巴西
(3)在“黑子峰年”(黑子数达到极大值的年份),下列行为能有效防范其影响的是( )
A.增加户外活动,增强皮肤的活力
B.加强监测和预报,做好应急准备
C.清除“宇宙垃圾”,保持太空清洁
D.扩大电信网络建设,保持网络通畅

【答案】
(1)A
(2)A
(3)B
【解析】试题考查太阳活动的影响

⑴太阳发脾气指的是太阳活动,可干扰无线电短波通信,使手机用户通话时信号时强时弱;
干扰地球磁场,使信鸽迷途,A正确;
只有高纬度地区会出现极光现象,而不是地球各地;
地球高层大气高速散逸到星际空间与太阳活动无关。

⑵因太阳发脾气而形成的空中梦幻景观是极光,出现在高纬度地区,四个国家相比,加拿大的纬度最高,最可能欣赏到极光,A正确。

⑶黑子数达到极大值的年份,紫外线较强,应减少户外活动,避免被晒伤;
应加强监测和预报,做好应急准备,B正确;
太阳活动与宇宙垃圾无关;
太阳活动会干扰无线电短波通信,扩大电信网络建设,也会受太阳活动的影响。
所以答案是:(1)A;(2)A;(3)B。

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【题目】阅读理解
Along the river banks of the Amazon and the Orinoco there lives a bird that swims before it can fly,flies like a fat chicken,eats green leaves,has the stomach of a cow and has claws(爪)on its wings when young.They build their homes about 4.6m above the river,an important feature(特征)for the safety of the young.It is called the hoatzin.
In appearance,the birds of both sexes look very much alike with brown on the back and cream and red on the underside.The head is small,with a large set of feathers on the top,bright red eyes,and blue skin.Its nearest relatives are the common birds,cuckoos.Its most striking feature,though,is only found in the young.
Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip.Using these four claws,together with the beak(喙),they can climb about in the bushes,looking very much like primitive birds must have done.When the young hoatzins have learned to fly,they lose their claws.
During the drier months between December and March,hoatzins fly about the forest in groups of 20 to 30 birds, but in April,when the rainy season begins,they collect together in smaller living units of two to seven birds for producing purposes.
(1)What is the text mainly about?
A.Hoatzins in dry and rainy seasons.
B.The relatives and enemies of hoatzins.
C.Primitive birds and hoatzins of the Amazon.
D.The appearance and living habits of hoatzins.
(2)Young hoatzins are different from their parents in that.
A.they look like young cuckoos
B.they have claws on the wings
C.they eat a lot like a cow
D.they live on river banks
(3)What can we infer about primitive birds from the text?
A.They had claws to help them climb.
B.They could fly long distances.
C.They had four wings like hoatzins.
D.They had a head with long feathers on the top.
(4)Why do hoatzins collect together in smaller groups when the rainy season comes?
A.To find more food.
B.To keep themselves warm.
C.To protect themselves better.
D.To produce their young.

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