单项选择题

The installation of radar is supposed to keep track of airlines in the __________.

A．velocity
B．proximity
C．terrain
D．vicinity
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单项选择题
The game requires to __________ more or less a hundred parts together.
A．merge
B．contemplate
C．detach
D．browse
单项选择题
The full-color illustrations will motivate children's interest and provide an excellent ______ for both oral and written work.
A．milestone
B．intersection
C．turning-point
D．springboard
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