单项选择题

A．I-20.
B．Green visa.
C．F-1 visa.
D．F-2 visa.
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单项选择题
A．They bumped into each other over a swimming pool.B．They avoided each other by turning in different directions.C．They narrowly escaped crashing into each other.D．One plane climbed above the other at the critical moment.
A．They bumped into each other over a swimming pool.
B．They avoided each other by turning in different directions.
C．They narrowly escaped crashing into each other.
D．One plane climbed above the other at the critical moment.
单项选择题
A．About 80 miles per second.B．About 70 miles per second.C．About 18 miles per second.D．About 17 miles per second.
A．About 80 miles per second.
B．About 70 miles per second.
C．About 18 miles per second.
D．About 17 miles per second.
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