单项选择题

The space animal theory would seem to indicate that ______.

A．living creatures are extremely adaptable
B．life in space is impossible for man
C．the fittest creatures always survive
D．life cannot exist in the depth of the sea

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热门试题

单项选择题

This passage is primarily about ______.

A．the greenhouse effect
B．the burning of fossil fuels
C．the potential effect of air pollution
D．the likelihood of a new ice age

单项选择题

As to the greenhouse effect, the author ______.

A．shares the same view with the scientists
B．is uncertain of its occurrence
C．rejects it as being ungrounded
D．thinks that it will destroy the world soon