单项选择题

The passage is primarily concerned with ______.

A． analyzing the extraterrestrial materials.
B． informing readers of the debate on life on Mars.
C． describing surface of Mars.
D． reporting the NASA conference on the meteorite ALH84001.

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单项选择题

The word fiasco as used in Para. 4 is closest in meaning to ______.

A． revolution
B． victory
C． confusion
D． failure

单项选择题

It can be inferred form the passage that ______.

A． there was once a wave of Mars exploration by scientists.
B． life has existed on Mars.
C． Lowell's claim is proved incorrect today.
D． It's a waste of time to try to answer the question concerning life on Mars.