单项选择题

A．They are impossible to guide.
B．They may go up in flames.
C．They tend to leak gas.
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单项选择题
A．It’s a lovely place.B．It’s a friendly place.C．It’s a nice place for man to live.D．It’s a lifeless place.
A．It’s a lovely place.
B．It’s a friendly place.
C．It’s a nice place for man to live.
D．It’s a lifeless place.
单项选择题
A．Kid’s play balloons.B．Weather balloons.C．Balloons for safety patrols.D．Balloons for recreation.
A．Kid’s play balloons.
B．Weather balloons.
C．Balloons for safety patrols.
D．Balloons for recreation.
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