单项选择题

Rocket can fly to the moon because ______.

A．it looks like a balloon
B．it is lighter than an airplane
C．it doesn"t have wings
D．it works like an untied balloon
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单项选择题
The failure of Vonngeut s first experiment was due to ______.
A．the impurity of the silver iodide he used
B．inadequate amount of the silver iodide he used
C．the substance he chose for the experiment
D．his limited ability
单项选择题
When an airplane flies too high, ______.
A．the air will be too thin to support its wing
B．the air will become thicker
C．the air will exert pressure on it
D．the air will disappear in no time
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