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A．Because there is no water there.
B．Because there is no plant there.
C．Because there is no air there.
D．Because there is lifeless.
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单项选择题A) They are impossible to guide. C) They tend to leak gas. B) They may go up in flames. D} They are cheaply made.

A) They are impossible to guide. C) They tend to leak gas. B) They may go up in flames. D} They are cheaply made.

单项选择题A．They are usually very high.B．they can be very different.C．They are always very low.D．They are actually the same.

A．They are usually very high.
B．they can be very different.
C．They are always very low.
D．They are actually the same.