单项选择题

A．By selling services that make life comfortable.
B．By selling land containing oil.
C．By selling public lands.
D．By selling coal and other natural products.
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单项选择题
What does the passage say about asteroids and meteoroids
A．They are heavenly bodies different in composition.
B．They are heavenly bodies similar in nature.
C．There are more asteroids than meteoroids.
D．Asteroids are more mysterious than meteoroids.
单项选择题
Thank-you cards seem to become rare because___________.
A．interaction between people has been diminished than before
B．the etiquette of thank-you notes has become out of date
C．people have found better means of expressing their thanks
D．people have become forgetful in the new age
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