单项选择题

What do scientists say about the violent coming course of an asteroid with the earth（）

A．Violent coming courses of smaller asteroids with earth take place often than expected.
B．It's still too early to say whether such a violent coming course might happen.
C．Such a violent coming course might happen once every 25 years.
D．It is very unlikely but the danger exists.

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单项选择题

The world plan mentioned in the passage aims at （）

A．help the illiterates learn the basic skills of reading and writing
B．emphasizing the function of UNESCO
C．teaching basic skills to responsible citizens
D．helping people gather information

单项选择题

It can be learned from the passage that UNESCO（）

A．holds international conference on the subject of illiteracy regularly
B．is an organization attached to the United Nations
C．has done much to help the illiterates learn to read and write
D．is a big company in Paris