2. 外语
  3. We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).

We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).

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问题 We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).
选项 A、before we
B、because
C、more slowly
D、light is
答案D
解析 比较级前面是实义动词travel，后面应该用does代替。
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