13.Fire ants(火蟻) are famous for their construction projects (as well as their burning bites).When they need to,colonies of these insects turn themselves into ladders,chains and walls.And when flood water rises,a colony can float to safety by making an unusual boat.The ants hold tightly to each other,forming a floating disk atop the water.The antraft may float for months seeking safe harbor.The ants on the bottom don't drown,and the ants on the top stay dry.Working together,the ants float to safety---even though a single ant alone in the water will struggle to survive.
"They have to stay together as a colony to survive."Nathan Mlot said.
Fire ants and water don't mix.The ant's hard outer shell,naturally repels water.A drop of water can sit on top of the ant like a backpack.When an ant does end up underwater,tiny hairs on its body can trap bubbles of air that give the bug a boost up (托起).
To investigate the science behind the antraft,the scientists placed hundreds or thousands of ants at a time in the water.A group of ants took about 100seconds,on average,to build a raft.The researchers repeated the experiment multiple times.Each time,the ants organized themselves the same way,creating a raft were flexible and strong,staying together even when the researchers pushed the rafts underwater.
The scientists then froze the rafts in liquid nitrogen and studied them under powerful microscopes to figure out how the ants kept everyone safe and the water out.
The team found that some ants used their jaws to bite other ants'legs.Other ants joined their legs together.Thanks to these tight bonds,say the scientists,the ants did a better job at keeping the water away than any one ant could do on its own.By working together,thousands of ants can stay alive in the face of a crisis like a flood by using their own bodies to build a boat.

46.When flood comes,fire antsC.
A.will run away separately
B.find a hole to hide themselves
C.combine themselves into a raft
D.climb onto boats on the water
47.What makes fire ants stay afloat?A
A.Tiny hairs on their body.
B.Their hard outer shell.
C.Their slippery skin.
D.Their backpack on its body top.
48.After scientists put fire ants into the water,theyB.
A.built a raft in 100minutes
B.organized themselves into a flexible raft
C.organized themselves in different ways
D.liked to look for the food of pancakes
49.The story of fire ants proves the importance ofC.
A.practice    B.calmness       C.cooperation     D.speed
50.The purpose of writing this text is to introduceD.
A.how fire ants react in face of danger
B.fire ants'differences from common ants
C.fire ants'ability to live underwater
D.the building ability of fire ants.

分析 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了洪水來臨時,火蟻能聯(lián)合成船,是團隊合作讓他們的種族得以延續(xù).

解答 46.C.細節(jié)理解題.根據(jù)第一段And when flood water rises,a colony can float to safety by making an unusual boa可知洪水來臨時,火蟻能聯(lián)合成船;故選C.
47.A.細節(jié)理解題.根據(jù)第三段When an ant does end up underwater,tiny hairs on its body can trap bubbles of air that give the bug a boost up 可知是他們身體上的微小毛發(fā)讓火蟻保持漂浮狀態(tài);故選A.
48.B.細節(jié)理解題.根據(jù)第四段Each time,the ants organized themselves the same way,creating a raft were flexible and strong,staying together even when the researchers pushed the rafts underwater可知科學(xué)家把火蟻放入水中后它們能組成柔性伐;故選B.
49.C.推理判斷題.根據(jù)最后一段By working together,thousands of ants can stay alive in the face of a crisis like a flood by using their own bodies to build a boat可知火蟻的故事證明了合作的重要性;故選C.
50.D.推理判斷題.根據(jù)最后一段By working together,thousands of ants can stay alive in the face of a crisis like a flood by using their own bodies to build a boat可知本文的寫作目的是介紹火蟻的建設(shè)能力;故選D.

點評 考察學(xué)生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.

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