单项选择题

Human beings have used tools for a long time, ______ they would not have been able to develop their intelligent so fast.

A．doubtlessly
B．therefore
C．otherwise
D．consequently
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单项选择题
Education, reserved to the states or the people in the U.S., is a ______ of the state, not the federal government.
A．condition
B．performance
C．requirement
D．function
单项选择题
It is really surprising that the hotel should be ______ booked even at this time of the year.
A．immediately
B．quickly
C．heavily
D．intensely
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