单项选择题

Whether there is life beyond the earth is ______.

A．the only question that excites people
B．one of several questions which excite people
C．one of the most exciting questions
D．the question which most excites people

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热门试题

单项选择题

Life on other planets is possible ______.

A．when life-evoking conditions exist
B．only when their conditions match those of the earth
C．when the temperature is neither too hot nor too cold
D．when the atmosphere is not too dry

单项选择题

Life on the planet Jupiter is a possibility which ______.

A．does not exist
B．should not be ruled out
C．excites all scientists
D．has never been explored