蚊子或能抑制登革熱傳染

　　7月31日CNN聽力：基因突變蚊子或能克制登革熱沾染

　　Time for "THE SHOUTOUT."

　　Worldwide,there are about 3500 species of whatanimal-if you think you know it,shout it out.

　　Is it mosquitoes,cats,horses or sea urchins?

　　You got three seconds,go.

　　These animals there are more different species ofmosquitoes than the others combined.

　　That's your answer and that's your shoutout.

　　All right,the problem: mosquitoes.

　　The Florida Keys have them. One solution,insecticides.

　　They've been sprayed for many years across the Keys,keeping the bugs at bay.

　　But there is one species of mosquito that's built up a resistance to many of the pesticides,andthat species can carry dangerous diseases like dengue and yellow fever.

　　So,another proposed solution,mutant mosquitoes.

　　A British company has found a way to genetically modify mosquitoes to kill their offspring.

　　It wants to release millions of them into the Keys to ultimately kill off the dengue carryingmosquito species.

　　It says no human will be bitten by a genetically modified mosquito because it will only releasemale mosquitoes which don't bite.

　　But some critics think that biting females could somehow get into the genetically modifiedpopulation.

　　What then?

　　Also,they question the need for the experiment:

　　dengue fever isn't the major health threat in the Florida Keys.

　　Almost 140,000 people have signed the petition to keep this from happening.

　　The FDA would have to approve it.

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