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3试卷答案试题(英语))
crickets while wandering around an outdoor market near their home.As food lovers,theyagreed the insects were delicious.This led the 18-year-olds to seek out a cricket farm,wherethey learned about a major problem faced by the cricket farmers.Those farmers tend to keep groups of crickets in close quarters.Bigger crickets oftenattack the smaller ones.When attacked,a cricket will cut its own limb (to escape.Butafter giving up a limb,it will die.The teens left the cricket farm with some hundred cricket eggs.To solve the leg-cuttingproblem,they filled each of their boxes with 30 newly-born larvae ()The crickets in sixboxes were lit only with red light.Another six boxes were lit with green.And six more boxeswere lit with blue.And the last six boxes of crickets lived in natural light.About two months later,they found that about 9 in every 10 among those living in red,blue or natural light lost limbs.But fewer than 7 in every 10 crickets who grew up in a world ofgreen lost limbs.Also,the survival rate for crickets in the green light boxes was four or fivetimes higher than in the other boxes.Crickets'eyes can see only in green and blue lights,the teens learned.So,in red light,theworld would always look dark.Being unable to see,they're more likely to bump into each otherand fight.Crickets are more attracted to blue light than green light,which pulls them closertogether and leads to more fights.In the green light boxes,the crickets were most likely tomind their own business and shun fights.So creating a green-light world for crickets is asolution that could be brought to the farms.15.What made the two teens become interested in crickets?A.Their visit to a cricket farm.B.The trouble in raising crickets.C.Their eating crickets one day.D.Their desire to win a competition.16.What do we know about the teens'research work?A.They got a lot of free cricket eggs.B.The boxes were made in different shapes.C.The cricket eggs were divided into two groups.D.Twenty-four boxes were used to house larvae.17.What did the teens most probably keep record of in their study?A.How crickets protected themselves.B.How many crickets lost limbs and died.C.How often crickets fought with each other.D.How crickets ate food in different lights.海一·16·一列一（八）英N诚
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