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  3. The gardens and fields of Britain were saved from a grim invasion this spring. Thanks to the sharp, late frosts of May, millions

The gardens and fields of Britain were saved from a grim invasion this spring. Thanks to the sharp, late frosts of May, millions

admin2017-11-08  14
问题    The gardens and fields of Britain were saved from a grim invasion this spring. Thanks to the sharp, late frosts of May, millions of giant Spanish slugs—which threatened to devastate plants across the country—were killed. But now experts fear that Spanish slugs—which was first spotted in East Anglia a year ago—may soon make an unwelcome return to our shores. They have decided to seek public help to spot a menace which one expert described as "a disaster waiting to happen".
   A group of scientists led by Dr. Ian Bedford, head of entomology (昆虫学) at the John Innes Centre, Norwich, have created a "slugwatch" website, so people can report where and when they have seen Spanish slugs. There will also be instructions on building traps to catch them. "The Spanish slug is a voracious predator. It eats crops spared by our native slugs, tolerates drier conditions, reproduces in greater numbers and even eats dead animals and excrement," said Bedford. " We want photos and sightings from members of the public to help build a picture of how widespread the Spanish slug is. The reports may also give us an idea of whether it is breeding with native species to form a hybrid with tolerance to frosts and cold from our own species."
   The species appeared in Scandinavia a few years ago, where they bred so quickly that squashed slugs on roads became a serious traffic hazard. Very soon, it looked as if Britain would follow suit. "In early spring, numbers of the slugs began to appear and it looked as if we were in trouble," said Bedford. "But the late spring frosts seemed to have killed off baby Spanish slugs and saved us—for the time being."
   Scientists stress that slugs play an important role in the ecosystem: they are natural composters, breaking down vegetation, and provide food for our hedgehogs, toads and some garden birds. However, the Spanish slug could prove to be an even greater threat. "We need to know exactly how they are distributed and that is why we have set up this website," saidBedford. " We need public help, badly."
Which cannot be inferred from the last paragraph?
选项 A、Although slug is not welcomed by many people, it indeed has some positive roles.
B、Spanish slug is proved to be a terrible predator, who threatens people’s life.
C、Public needs to play its role in coping with disasters brought by Spanish slug.
D、Spanish slug plays an important role in the ecosystem, public does not need to eliminate it.
答案D
解析 注意题目是要选出“不能”从文中得出的选项。最后一段主要讲述了蛞蝓在生态环境中的作用，但同时也指出西班牙蛞蝓对人类巨大的威胁。因此科学家希望寻求公众的帮助。所以D选项说人们不需要消灭西班牙蛞蝓的说法是不正确的。
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