单项选择题

It’s known to all that light travels much more quickly than sound does. A. 所有知道的全部内容就是光跑的速度要比声音快得多。 B．所有的人都知道光跑的速度要远远快过声音跑的速度。 C．众所周知，光传播的速度比声音传播的速度快得多。 D．关于那种光所得知的内容就是比声音传播得要快。
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单项选择题
The Egyptians considered that ball playing was ______.
A．childish
B．hard
C．no enjoyment
D．worthwhile
单项选择题
The main idea of the passage is that ______.
A．the sun is our ultimate source of energy
B．the tiny fraction of the sun’s energy which we use is used indirectly
C．we are making progress toward utilizing the solar energy fully
D．one device using solar energy directly has been developed
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