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共用题干 What's Killing the Bats?First it w

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问题 共用题干What's Killing the Bats?
First it was bees .Now it is bats.Biologists in America are working hard to discover the cause of the mysterious deaths of tens of thousands of bats in the northeastern part of the country.
Most of the bats affected are the common little brown bats(Myotis lucfugus),but other species, such as the long-eared bat,the small-footed bat,the eastern pipistrelle,and the Indiana bat have also been affected.In some caves,more than 90 percent of the bat populations have died.
One possibility is disease. A white fungus（真菌）known as fusarium has been found on the noses of both living and dead bats.However,scientists don't know if the fungus is the primary cause of death,a secondary cause of death,or not a cause at all,but the result of some other conditions.
Another possible cause is a lack of food.For example,bats typically eat a large number of moths（蛾）,and in some states such as New York,the number of moths has been declining in recent years.If bats can't eat enough food,they starve to death.
Still other scientists believe that global warming is to blame.Warmer temperatures in recent years have been waking up hibernating（冬眠）bats earlier than usual. If bats break their hibernation at the wrong time,they might not find their expected food sources.The weather might also turn cold again and weaken or kill the bats.
Scientists might not agree on the causes of the bat die-off,but they do agree on the consequences.Bats are an important predator of mosquitoes;a single brown bat can eat 1,000 or more insects in an hour. They also eat beetles and other insects that damage plant crops.If there aren't enough bats,damage will be great from the insects they eat.
While bats live a long time for their size-the little brown bat can live for more than 30 years-a female bat has only one baby per year,so bat populations grow slowly. Many bat species in the United States are already protected or endangered.
How can you help?Do not disturb sleeping or nesting bats.If you discover bats that seem to be sick or that are dead,contact your local Fish&Wildlife Department with the details.However,be careful not to touch the animals.What is the main idea of this passage?A: All species of bats in North America are dying.B: Scientists already know the cause of the deaths of bats.C: The bat deaths are a serious problem.D: There are many possible causes of the deaths of bats.
选项 What is the main idea of this passage?
A: All species of bats in North America are dying.
B: Scientists already know the cause of the deaths of bats.
C: The bat deaths are a serious problem.
D: There are many possible causes of the deaths of bats.
答案 D
解析 文章的题目是“What's Killing the Bats?”第一段引入了蝙蝠离奇的死亡，第二、三段则写了编蝠死亡的几个可能的原因，第五段写了编蝠死亡带来的结果，最后一段告诉人们怎样帮助编蝠。故选D。


由第一段第一句“First it was bees. Now it is bats.”可知最初是蜜蜂；现在是蝙蝠；后边说了编蝠离奇死亡，说明蜜蜂也曾离奇死亡。故选A。


由第一段第四句“Most of the bats affected are…the Indiana bat have also been affect-ed.”知道大多数遭受感染的编蝠是常见的小棕蝠，但是也有其他种类的编蝠，比如长耳编蝠、小脚编蝠、东方的pipistrelle以及印第安纳编蝠。由此可知，pipistrelle指的也是一种编蝠。故选D。


由第三段“Another possible cause is a lack of food. For example, bats typically eat a large number of moths,”可知，moths指的是一种编蝠捕食的昆虫。故选B。


由最后一段首句“How can you help?”及随后的对该问题的回答。故选D。
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