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问题 选择题

John rushed out in a hurry，                the door                   .

A．leaving; unlocked

B．leaving; unlocking

C．left; unlocked　

D．to leave; unlocking

答案

答案：A

考查非谓语动词用法。现在分词doing做状语，表示意料之中的结果，本题John着急地跑了出去，留着门没有锁，这是意料之中的结果。Door与unlock构成被动关系，使用过去分词。句意：John匆忙地跑了出去，留着门都没有锁。故A正确。

判断题

严格执行“两票三制”，落实好领导干部安全职责，并按要求规范填写两票内容，确保安全措施全面到位。（）
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单项选择题

(五)


Space travel is definitely bad for astronauts’ bones, reducing their bone density after only a month of weightlessness, according to French research published on Friday.
Laurence Vico and his fellow workers at St Etienne University called for more research into the effects of microgravity, after their study of 15 astronauts from the Russian MIR station showed bone loss continued throughout space flights.
"Bone loss was especially striking in four astronauts, " the scientists reported in the Lancet Medical Journal.
They measured the Bone Mineral Density(BMD) of bones in the forearm and lower leg of the astronauts who had spent one to six months in space.
The BMD loss was significant in the tibia of the lower leg, a weight-bearing bone, but barely changed in the radius of the forearm. "Our results indicate the need to investigate not only different bones, but also different areas of the same bone since not all sites of the skeleton are similarly affected by space conditions, " they added.
Without gravity the body isn’t bearing any weight so there is no need for calcium which makes bones p, and it becomes empty into the bloodstream.
The research team suggested in future scientists should try to determine if the loss of bone density was only on weight-bearing bones on longer flights, also the possible recovery after returning to Earth.

Scientists have found that ______ .

A．the BMD loss may cause serious illness to astronauts

B．the BMI) loss may cause some change in astronauts’ bodies

C．astronauts shouldn’t care about the BMD loss

D．astronauts should take some calcium before space travel
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