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CR: CA, 正确答案CC,注意explain的题两个方向都需要解释
1, Link: being perceived as fit-->directly contribute to one's physical health.2, explain: majority select the cash bonus, but dissatisfaction;
A. explain only dissatisfaction; BE. explain only dissatisfaction; C. no time for vacations-->explain popularity; compelled to take the cash-->explain dissatisfaction;
D.sometimes->explain neither.
RC: CCDDB, 全对
1, sparse interstellar medium: hydrogen, dust;
2,dust: not uniform, obscure the light in certain areas;
345, been inferred by astronomers;
one pivotal discovery: dimmer but redder-->absorb shorter wavelengths like blue light more than longones like red light.-->analogous to Earth's atmosphere, dif from the Doppler effect.
the meaning of discovery: conclusions about the dust grain size=>smaller than red, but comparable to blue=>akin to the relationship between ocean wave and rock
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