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职称英语考试理工类(B级)真题及答案

职称英语考试理工类(B级)真题及答案4

第二篇Where Have All the Bees Gone?

Scientists who study insects have a real mystery on their hands.All across the country, honeybees are leaving their hives(蜂巢)and never returning.Researchers call this phenomenon colony-collapse(群体瘫痪)disorder.It is reposed that 25 to 40 percent of the honeybees in the US have vanished from their hives since last fall.So far, no one can explain why.

Colony collapse is a serious concern because bees play an important role in the production of about one—third of the foods we eat.As they feed，honeybees spread pollen (花粉)from flower to flower.Without this process，a plant can’t produce seeds or fruits.

Now，a group of scientists and beekeepers have teamed up to try to figure out what’S causing the alarming collapse of SO many colonies.They hope to find out what’S contributing to the decline and to prevent bee disappearance in the future.

It could be that disease is causing the disappearance of the bees.To explore that possibility, Jay Evans，a researcher at the United States Department of Agriculture (SDA)Bee Research Laboratory, examines bees taken from colonies that are collapsing.“We know what a healthy bee should Look Like on the inside.and we can look for physical signs of disease.”he says.And b ees from collapsing colonies don’t look very healthy.“Their stomachs are worn https://www.docsj.com/doc/b312958504.html,pared to the stomachs of healthy bees，”‘Evans says.It may be that a parasite(寄生虫)making the bees’digestive organs. Their immune(免疫的)systems may not be working as they should.Moreover，they have high levels of bacteria inside their bodies.

Another cause of colony—collapse disorder may be certain chemicals that farmers

apply to kill unwanted insects on crops，says Jerry Hayes，chief bee inspector for the Florida Department of Agriculture.Some studies，he says，suggest that a certain type of insecticide(杀虫剂)affects the honeybee’S newels system and memory.“It seems like honeybees are going out and getting confused about where to go and what to do”he says.

1f it turns out that a disease is contributing to colony collapse，bees’genes could explain why some colonies have collapsed and others have not.In any group of bees there are many different kinds of genes.The more different genes a group has，the higher the group’S genetic diversity.So far scientists haven’t determined the role of genetic diversity in colony collapse，but it’s a promising theory，says Evans.

36. What is the mystery that researchers find hard to explain?

A. Honeybees are flying all across the country.

B. Half of the honeybees in the US have died.

C. Honeybees are leaving their hives and do not return.

D. Honeybee hives are in disorder.

37. Researchers are seriously concerned with the phenomenon of colony—collapse disorder because

A. honeybees help produce one-third of the foods we eat

B. parasites on bees may spread everywhere.

C. honeybees cannot find enough food elsewhere.

D. honeybees feed on flowers.

38. Which of the following is a possible cause of the colony-collapse disorder?

A. Population explosion.

B. Decreasing number of flowers around.

C. Genetically modified products.

D. Diseases and chemicals.

39. Which of the following explanations is given by Jerry Hayes to the phenomenon?

A. Bee-keepers do not understand the honeybee’S behavior.

B. A certain type of chemical destroys the honeybee’S newels system.

C. Honeybees are infected by unwanted insects.

D. Some crops are poisonous to the honeybees.

40. The word “diversity’in the last paragraph means

A. variety.来源：考试大

B. makeup.

C. disorder.www.Ｅhttps://www.docsj.com/doc/b312958504.html,

D. distinction

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