We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).
A.before we
B.because
C.more slowly
D.light is
第8题
A.面目肌肤黄如橘子
B.饥不欲食
C.便血,肌衄
D.头身困重
E.少气懒言
脾胃湿热可见E.
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