单项选择题

The newest satellite can ______ a thousand telephone conversations and a colour TV program at the same time.

A．carry
B．extend
C．bring
D．take

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单项选择题

The psychologist picked several students ______ and said that they were highly intelligent and would achieve great success.

A．by accident
B．at random
C．on occasion
D．by chance

单项选择题

If you don't know the answer to this question, it is ______ to leave it blank and deal with the other items first.

A．valuable
B．advisable
C．considerable
D．probable

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