单项选择题

People are finding less and less time for relaxing themselves because ______.

A．they do not know how to enjoy themselves
B．they do not believe that relaxation is important for health
C．they are traveling fast all the time
D．they are becoming busier with their work
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单项选择题
Which of the following statements is TRUE according to the passage
A．Hooke and Huygens received the support from many scientists as Hooke was a leader of the Royal Society.
B．People changed their opinions of Newton simply because he had the theory of gravity published.
C．Tile quantum theory seems better than other theories so it is used most often to explain how light travels.
D．The quantum theory seems to be nearest in idea to that of Fresnel and Newton combined.
单项选择题
The evidence of this passage shows that ______.
A．the presently-accepted theory of light will soon be replaced by another new theory
B．scientists do not know enough to develop the most satisfactory theory of light
C．there would be no progress in our knowledge of light unless we questioned accepted theories
D．earlier scientists always aimed at the perfectness of a theory
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