单项选择题

A．They are exciting.
B．They are boring.
C．They are time-consuming.
D．They are rewarding.
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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
单项选择题
Which of the following phrases in the fifth paragraph indicates the fridge’’s negative effect on the environment
A．Hum away continuously.
B．Climatically almost unnecessary.
C．Artificially-cooled space.
D．With mild temperatures.
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