单项选择题

Which statement best expresses the main idea of the article

A．Many different kinds of medicine come from tropical forests.
B．Virtually all of the world' s rain forest has already been destroyed.
C．Tropical forests are disappearing at an alarming rate.
D．Tropical deforestation affects people in all parts of the glob

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单项选择题

If the percentage of carbon dioxide in the air continues to increase at current rates______.

A．average daily temperatures worldwide could increase considerably
B．some sea level islands could be threatened by flooding
C．all coastal regions throughout the world could be at serious risk
D．all of the above

单项选择题

How does a democratic nation influence poetry

A．It limits writing.
B．It enhances writing.
C．It embellishes writing.
D．It deepens writin