单项选择题

在相同的时间内，一束波长为l的单色光在空气和在玻璃中

A．传播的路程相等，走过的光程相等
B．传播的路程不相等，走过的光程相等
C．传播的路程相等，走过的光程不相等
D．传播的路程不相等，走过的光程不相等

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单项选择题

Choose the correct sentence(s) from the set of sentences below.
Women who believe abortions should remain legal recently held a rally in Washington DC.
A、Women who believe abortions should remain legal recently held a rally in Washington DC. (No commas)
B、Women, who believe abortions should remain legal recently held a rally in Washington DC.
C、Women who believe abortions should remain legal, recently held a rally in Washington DC.
D、Women, who believe abortions should remain legal, recently held a rally in Washington DC.

单项选择题

关于光的传播，以下说法中正确的是 ( )。 A.
光从一种介质进入另一种介质，速度发生变化。
B.
光在任何情况下总是沿直线传播的。 C.
光在不同介质中的传播速度都是3×m/s。 D.
光由空气中射向水面，有可能发生全反射。