单项选择题

What does the passage say about asteroids and meteoroids

A．They are heavenly bodies similar in nature.
B．There are more asteroids than meteoroids.
C．They are heavenly bodies different in composition.
D．Asteroids are more mysterious than meteoroids.

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单项选择题

The figure of illiteracy in Europe makes up ______.

A．3.4% of the total population in the world
B．2.5 % of the total illiterate in the world
C．1.7% of the total population in the word
D．1.7 % of the total illiterate in the world

单项选择题

According to the estimate, the illiterate population in the world is ______.

A．two hundred and fifty million
B．one hundred million
C．about half of the total population in the world
D．seven thousand million