单项选择题

What's the main idea of the passage

A．1970 was World Conservation Year.
B．The United Nations wanted everybody to know that the world is in danger.
C．World Conservation is necessary.
D．It is the young people who are helping to save our world.

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单项选择题

NO ONE'S GOING TO CHANGE OUR WORLD was ______.

A．an important book published in 1970
B．an idea that nobody would accept
C．a record calling on people to conserve nature
D．a rule worked out by the United States

单项选择题

It is difficult to get to know a reserved person because ______.

A．he only answers personal questions
B．he asks something only about you
C．he keeps himself to himself and never tells you anything about himself
D．he likes to talk with anyone about anything