问题 选择题

如图示某种昆虫的发育过程,下列叙述不正确的是(  )

A.该昆虫的发育过程属于完全变态发育

B.该昆虫的生殖方式是有性生殖

C.该图可表示蝗虫的发育过程

D.若该虫是一种害虫,则幼虫期对农作物的危害最大

答案

答案:C

题目分析:昆虫在个体发育中,经过卵、幼虫、蛹和成虫等4个时期的叫完全变态发育.完全变态发育的幼虫与成虫在形态构造和生活习性上明显不同,差异很大.如蝶、蚊、蝇、菜粉蝶、蜜蜂,蚕等.

不完全变态发育:幼体与成体的形态结构和生活习性非常相似,但各方面未发育成熟,发育经历卵、若虫、成虫三个时期.例如:蜻蜓、蟑螂、蝼蛄、蟋蟀、蝗虫等.图中昆虫的发育经过受精卵、幼虫、蛹和成虫等4个时期,因此属于完全变态发育.而蝗虫的发育经过卵、若虫、成虫三个时期,属于不完全变态发育.故该选项不符合题意;此图的生殖发育经过了两性生殖细胞的结合,属于有性生殖,故该选项不符合题意;图中昆虫的发育经过受精卵、幼虫、蛹和成虫等4个时期,而蝗虫的发育经过卵、若虫、成虫三个时期,属于不完全变态发育.故该选项符合题意;若该昆虫是一种害虫,则幼虫期对农作物危害最大,而成虫只吃少量的花粉或植物汁液,蛹不食不动.故该选项不符合题意.

点评:此题是中考的重点,解答时可以从图中昆虫的发育过程方面来切入.关键是理解完全变态的发育特点。

完形填空
It's fourteen years since I left the Philippines to live with my family in the USA. A month ago, while on summer vacation back in my motherland, I learned a lesson from mosquito (蚊子) bites. Right before   16  Kennedy Airport in New York, my grandma   17  me of the behavior of the native mosquitoes around the   18  like me. She said, "There's an old saying—the   19  you stay away from the motherland, the sweeter your blood   20  to the mosquitoes. " Not   21  it, I replied, "Grandma, that's just an old wives' tale!" 
Well, less than a week   22  my arrival in Manila, I was already carpeted with a   23  of mosquito bites. I took many measures to keep myself from being   24  , but they all proved useless.
Late one   25  in my cousin's home, I couldn't bear the   26  of the bites. Hoping to find some comfort, I   27  my cousin, who was sleeping peacefully in the bed next to mine. Unhappy for being   28   she said, "There is nothing you can do. Go back to sleep. "  With a few turns, she slept again. Enviously (妒嫉地)   29  her sleep, I hoped a big mosquito would   30  on her face.  However, the mosquitoes would just lightly dance around her forehead and fly away quickly, never biting her. Amazed (惊奇的), I ran to others'   31  , only to find they were all sleeping  32  as the same thing occurred again and again.
From those bites, I came to   33  my grandma's silly tale. From then on, I've always tried to keep a(n)  34  mind about those strange old wives' tales   35  they do have some truth to them.
小题1:
A.leavingB.passingC.visitingD.finding
小题2:
A.persuadedB.remindedC. warnedD. informed
小题3:
A.studentsB.foreignersC.passengersD.visitors
小题4:
A.earlierB.longerC.soonerD.later
小题5:
A.growsB.goesC.flowsD.remains
小题6:
A.expectingB.understandingC.recognizingD.believing
小题7:
A.afterB.beforeC.whenD.as
小题8:
A.shadeB.pileC.cloudD.blanket
小题9:
A.touchedB.bittenC.defeatedD.discovered
小题10:
A.morningB.afternoonC.eveningD.night
小题11:
A.noiseB.hitC.painD.effect
小题12:
A.woke upB.shouted atC.looked forD.dropped on
小题13:
A.blamedB.interruptedC.movedD.frightened
小题14:
A.havingB.watchingC.makingD.helping
小题15:
A.landB.flyC.fallD.wait
小题16:
A.housesB.flatsC.roomsD.homes
小题17:
A.joyfullyB.anxiouslyC.soundlesslyD.worriedly
小题18:
A.tellB.knowC.rememberD.accept
小题19:
A.openB.activeC.clearD.honest
小题20:
A.andB.soC.becauseD.until
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