单项选择题

I'm sure the letter won't arrive in time ______ it is sent by air.

A．if
B．until
C．because
D．unless
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单项选择题
The term tsunami ______ the Japanese language meaning harbour and wave.
A．comes across
B．comes from
C．comes by
D．comes down
单项选择题
______ that they may eventually reduce the amount of labor needed on construction sites.
A．So clever are the construction robots
B．So clever the construction robots are
C．Such construction robots are clever
D．Such clever construction robots are
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