【題目】Have you ever heard of a bug（蟲子）called the cicada（蟬）?Well,a special kind of these bugs live underground in the US for most of their lives.They have an interesting bio-clock.【1】

Every 17 years,billions of the noisy Brood V cicadas will swarm（涌現(xiàn)）to northeastern parts of the US, including New York,Ohio and Pennsylvania.【2】But there are usually a lot less of them compared to the Brood V cicadas.

【3】According to Discovery News,these bugs started their lives in 1999.And as their 17-year life cycle comes to an end,they go above ground when their underground homes get warmer—64 degrees Fahrenheit (about 18℃) to be exact.Then the females will lay hundreds of eggs in trees.【4】The baby cicadas will go underground,and the 17-year cycle will start over again.

While they can be kind of annoying,these bugs don't harm humans.【5】That sound is the male cicadas attracting the female cicadas.Besides,a large amount of laid eggs can sometimes harm small trees and bushes because there are so many of the 17-year cicadas.However,after this summer,these bugs will mostly mind their own business until 2033.

A.They feed on leaves and roots.

B.It tells them when to go above ground.

C.What makes Brood V cicadas so special?

D.But they do make a lot of noise during their time above ground.

E.After about four to six weeks,the mother and father cicadas will die.

F.For a different brood of cicadas,mating season is just around the corner.

G.There are other kinds of cicadas that come around once a year or every 13 years.

【答案】

【1】B

【2】G

【3】C

【4】E

【5】D

【解析】 本文屬于科普文章。主要講述了有一種蟬，每17年就會(huì)大量涌向美國(guó)的地面。

【1】B

考查對(duì)上下文的理解與推理判斷能力。根據(jù)上句可知這種蟬一生中大部分時(shí)間生活在美國(guó)的地下，但它們有一個(gè)有趣的生物鐘，可以喚醒它們出現(xiàn)到地面上，故選B。

【2】G

考查對(duì)上下文的理解與推理判斷能力。本空前面的內(nèi)容說(shuō)數(shù)十億育雛V蟬的涌現(xiàn)，空后說(shuō)有一種比它們少。分析選項(xiàng)G項(xiàng)（有其他種類的蟬，一年一次或每13年一次）顯然符合題意，形成對(duì)比對(duì)。故選G項(xiàng)。

【3】C

考查對(duì)上下文的理解與推理判斷能力。根據(jù)空后本段內(nèi)容可知主要敘述這種蟬的生活特性。分析選項(xiàng)可知C項(xiàng)可知符全題意。故選C。

【4】E

考查對(duì)上下文的理解與推理判斷能力�？蘸笾v述幼蟲的回到地下，17年后又一個(gè)輪回，可知是生死輪回。分析選項(xiàng)可知E.幼蟬的父母死去，幼蟲的誕生符合題意，故選E。

【5】D

考查對(duì)上下文的理解與推理判斷能力。分析空前內(nèi)容可知蟬雖然對(duì)人類無(wú)害，但卻讓人生氣。

尤其是第一句的詞“kind of annoying”，正與D項(xiàng)（但是他們?cè)诘厣系臅r(shí)候確實(shí)發(fā)出很多噪音）相符合。故選D。

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