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问题 单项选择题

根据“议程设置功能”理论，传播媒介不仅是重要的信息源，而且是重要的（）。

A、影响源

B、经济源

C、政治源

D、组织源

答案

参考答案：A

单项选择题

工作人员岗位变动后，从变动的（）起执行新聘岗位的工资标准。

A、当月

B、下月

C、当月或下月均可

D、上月
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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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