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单项选择题
A．They both form in large spherical masses.B．They are both made of tiny water droplets.C．They are both common only in cold climates.D．They both change shape when temperatures vary.
A．They both form in large spherical masses.
B．They are both made of tiny water droplets.
C．They are both common only in cold climates.
D．They both change shape when temperatures vary.
单项选择题
A．They can be built to be very light.B．They are inexpensive to operate.C．They can be directed by remote control.D．They easily connect distant points.
A．They can be built to be very light.
B．They are inexpensive to operate.
C．They can be directed by remote control.
D．They easily connect distant points.
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