Questions15 to 17 are based on the following p
问题详情
Questions15 to 17 are based on the following passage. At the end o f the passage, you will be given 15 3econds to answer the questions.
Now, listen to the passage.
What do plants do when they are thirsty？
[A] They give out faint cries.
[B] They make noises to drive away insects.
[C] They extend their water pipes.
[D] They become elastic like rubber bands.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：A
Passage2【听前预测】观察题干和选项信息，由plants，insects，attack可以预测，短文内容与植物有关，涉及到昆虫对植物的伤害等等。weallscreamtorwaterwhenthirsty.Butdoyouknow[15A]inveryhot,出yweatherplantsalsomakefaintsounds---asifthey'recryingoutforhelp?Yousee,inaplant'sstemthere'rehundredsof"waterpipes"thatbringwaterandmineralsfromthesoilallthewayuptotheleaves.Asthegroundturnsdry,itbecomesharderandharderfortheplantstodothis.Inseveredroughts,plantshavetofighttopulloutanywateravailable.ScientistRobertWinterhasfoundoutthatwhenitisreallybadtheirwaterpipessnapfromthetensionlikerubberbands.Whenthathappens,thewholeplantvibratesalittle.Thesnappingpipesmakenoises10,000timesquieterthanawhisper.Robertknowsthathealthy,well-wateredplantsarequiet.Healsoknowsthat[16D]manyinsectspreferattackingdryplantsratherthanhealthyplants.Howdotheinsectsknowwhicharehealthyplantsandwhicharenot?Robertthinksthattheinsectsmaylistenfortheplantsthatcry.Andthentheymaybuzzintokill.Totesthistheory,Robertisusingadevicethatcanimitateplantcries.Heattachesittoaquiet,healthyplantsotheplantsoundsthirsty.Thenhewatchesinsectstoseeiftheyattackmoreoftenthanusual.[17D]Ifheisright,scientistsc0uldusetheinsects'abilityagainstthem.Theycouldbuildtrapsthatimitatecryingplants.Sowhentheinsectsbuzzintoeat,theywon'tbuzzout.?【解析】选[A]。题干关键词为plant，thirsty，所以注意相关信息。由原文提到的…inveryhot.，dryweatherplantsalsomakefaintsounds...可知答案为[A]。
