单项选择题

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

A．before we hear
B．causes
C．more slowly
D．light is
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单项选择题
(On his way) to school yesterday morning, Prof. Wang (came across) an old friend and (stopped talking) with him (for quite a while).
A．On his way
B．came across
C．stopped talking
D．for quite a while
单项选择题
The twins are so much ______ that it is difficult to tell one from the other.
A．similar
B．equal
C．like
D．alike
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