Without gravity the body isn’t bearing any weight so there is no need for calcium (钙) which makes bones strong, 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.

　　1. French scientists did their research on Russian astronauts, because _______.

　　A. they only cared for the Russian astronauts

　　B. they were not interested in their own astronauts

　　C. the Russian government invited them to do their research

　　D. the Russian astronauts worked in space for a long time

　　2. Scientists have found that _______.

　　A. the BMD loss may cause serious illness to astronauts

　　B. the BMD 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

　　3. What cause the BMD loss to astronauts, according to this passage?

　　A. The food they eat in space.

　　B. The drinks they take in space.

　　C. The temperature in space.

　　D. The gravity in space.

　　4. In the third paragraph, the word “striking” means ______.

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