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
填空题
included contained involved
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