单项选择题


A．contest
B．competition
C．races
D．choices
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单项选择题
The author's purpose in writing this article is to ______.
A．tell the reader not to rely only on statistics when dealing with the universe
B．encourage the reader to do some researches about the extraterrestrial life
C．tell the reader something about possible extraterrestrial life on other planets
D．show his interest in Aczel' s research in extraterrestrial life on other planets
单项选择题
Though challenged by many people, Aczel firmly believes that ______.
A．about 1 million planets in our galaxy are suitable for life
B．it is very likely for life to exist on other planets
C．life exists in approximately 150 billion stars in our galaxy
D．there are a very large number of planets suitable for life
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