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

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单项选择题

According to the information contained in the article, tropical deforestation______.

A．will continue relentlessly and cannot be prevented
B．may have critical consequences for tile survival of mankind
C．is not a really serious problem and reports have been widely exaggerated
D．is necessary for the economic development of non-industrialized countries

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 globe.