单项选择题

If you cross the ocean going east, you set your clock（）

A．ahead one hour in each new time zone
B．ahead one hour for the whole trip
C．back one full day for each time zone
D．ahead by twenty-three hour

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单项选择题
The passage implies that human beings differ from computers in that human beings（）

A．make fewer errors
B．do not have to be programmed
C．work more quickly
D．understand their instructions
单项选择题
She（）have missed the first bus, or she（）be here so early.

A．needn't, shouldn't
B．couldn't can't
C．shouldn't, mayn't
D．mustn't, wouldn't
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