单项选择题

Gas balloons are considered dangerous because ______.

A．they are impossible to guide
B．they may go up in flames
C．they tend to leak gas
D．they are cheaply made
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单项选择题
The notion of rainmaking came to man ______.
A．in 1946
B．in his earliest days
C．after 1946
D．after he could read
单项选择题
What type of balloon is the speaker referring to
A．Children"s play balloons.
B．Weather balloons.
C．Balloon used for safety patrols.
D．Balloon used for recreation.
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