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Researchers who picked up and analyzed wild chimp droppings said on Thursday they had shown how the AIDS virus originated in wild apes in Cameroon and then spread in humans across Africa and eventually the world. Their study, published in the journal Science, supports other studies that suggest people somehow caught the deadly human immunodeficiency virus (HIV) from chimpanzees, perhaps by killing and eating them.
"It says that the chimpanzee group that gave rise to HIV... this chimp community resides in Cameroon," said Beatrice Hahn of the University of Alabama, who led the study. "But that doesn’t mean the epidemic originated there because it didn’t," Hahn, who has been studying the genetic origin of HIV for years, said in a telephone interview.
"We actually know where the epidemic took off. The epidemic took off in Kinshasa, in Brazzaville." Kinshasa is in the Democratic Republic Congo, formerly Zaire, and faces Brazzav
A. monkeys are also susceptible to HIV.
B. AIDS has killed 25 million people in the last 25 years.
C. vaccine has been developed to prevent aids.
D. AIDS can be cured by drug cocktails.

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[单项选择]Researchers who picked up and analyzed wild chimp droppings said on Thursday they had shown how the AIDS virus originated in wild apes in Cameroon and then spread in humans across Africa and eventually the world. Their study, published in the journal Science, supports other studies that suggest people somehow caught the deadly human immunodeficiency virus (HIV) from chimpanzees, perhaps by killing and eating them.
"It says that the chimpanzee group that gave rise to HIV... this chimp community resides in Cameroon," said Beatrice Hahn of the University of Alabama, who led the study. "But that doesn’t mean the epidemic originated there because it didn’t," Hahn, who has been studying the genetic origin of HIV for years, said in a telephone interview.
"We actually know where the epidemic took off. The epidemic took off in Kinshasa, in Brazzaville." Kinshasa is in the Democratic Republic Congo, formerly Zaire, and faces Brazzaville, in Congo, across the Congo River. Studies have
A. Cameroon.
B. Kinshasa and Brazzaville.
C. Congo River.
D. Nile River.

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[单项选择]Who should sign up
A. Only students who have time for the work.
B. All the students who are at the meeting.
C. Only students who have a telephone.

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[单项选择]George entered the box and picked up one of the directories inside, （） that someone unknown had torn out the very page he needed
A. only to discover
B. discovered
C. to discover
D. only discovering

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W: Let me get the check.
M: No. You picked it up last time. It’s my turn today.

Where does the conversation probably take place（　）.
A. At home．
B. At a bank．
C. At a restaurant．

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[填空题]wild

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[单项选择]Who should sign up A. Only students who have time for the work. B. All the students who are at the meeting. C. Only students who have a telephone.

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[单项选择]（）, I picked up the phone and rang my sister in AustraliA．
A. Off impulse
B. On guard
C. Off guard
D. On impulse

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[简答题] (When) rocks are (picked up) by moving water, they are gradually (reduced size) by (the) breaking away of the edges and corners.

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