题目内容
20.听第9段材料,回答第14至16题.14.Where does Stella live?
A.In Memphis.B.In Boston.C.In St Louis.
15.What would Peter and his family like to do on Beale Street?
A.Visit a museum.B.Listen to music.C.Have dinner.
16.What kind of hotel does Peter prefer?
A.A big one.B.A quiet one.C.A modern one.
分析 略
解答 ABB
点评 略
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Scientists have found that all kinds of plants give out VOCs when being attacked.It's a plant's way of crying out.But is anyone listening?Apparently.Because we can watch the neighbors react.
Some plants pump out smelly chemicals to keep insects away.But others do double duty.They pump out perfumes designed to attract different insects who are natural enemies to the attackers.Once they arrive,the tables are turned.The attacker who was lunching now becomes lunch.
In study after study,it appears that these chemical conversations help the neighbors.The damage is usually more serious on the first plant,but the neighbors,relatively speaking,stay safer because they heard the alarm and knew what to do.
Does this mean that plants talk to each other?Scientists don't know.Maybe the first plant just made a cry of pain or was sending a message to its own branches,and so,in effect,was talking to itself.Perhaps the neighbors just happened to"overhear"the cry.So information was exchanged,but it wasn't a true,intentional back and forth.
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A.The attackers get attacked.
B.The insects gather under the table.
C.The plants get ready to fight back.
D.The perfumes attract natural enemies.
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A.predict natural disasters
B.protect themselves against insects
C.talk to one another intentionally
D.help their neighbors when necessary
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A.The world is changing faster than ever.
B.People have stronger senses than before.
C.The world is more complex than it seems.
D.People in Darwin's time were more imaginative.
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