单项选择题

A．To work in mining operations.
B．To carry scientific supplies.
C．To cross the North American continent.
D．To help cultivate the frontier.
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单项选择题
A．Their hardworking spirit.B．Their patience in waiting for theatre tickets.C．Their delight in leisure activities.D．Their enthusiasm for the arts.
A．Their hardworking spirit.
B．Their patience in waiting for theatre tickets.
C．Their delight in leisure activities.
D．Their enthusiasm for the arts.
单项选择题
Which of the following is NOT mentioned as one of the identification system requirements
A．Convenience.
B．Reliability.
C．Low costs.
D．Acceptability.
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