B. to improve people’s moral(道德的) level
C. to order people not to use the Internet
D. to find a medicine to kill computer viruses
参考答案--------51—55 CADDB
****************************************************结束
Agence FrancePresse—French doctors this week carried out the world’s first operation on a human in zero gravity,using a specially adapted aircraft to create conditions in space.
During a threehour flight from Bordeaux in southwest France,the team of surgeons and anaesthetists(麻醉师) successfully removed a benign tumor(良性瘤) from the forearm of a 46yearold volunteer.The experiment was part of a program backed by the European Space Agency to develop techniques for performing robotic surgery aboard the International Space Station or at a future Moon base.
“Now we know that a human being can be operated on in space without too many difficulties,” says the team leader Dr.Dominique Martin.
Under normal ground conditions,the operation would be performed under a local anaesthetic.Without gravity,the surgeon’s work is harder and the patient’s body reacts differently.Blood doesn’t pump in the same way.
The customdesigned Airbus 300 aircraft performed a series of parabolic swoops(抛物线飞行),each creating between 20 seconds of weightlessness.The process was repeated 32 times.
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