单项选择题

Which question is NOT answered in the article

A．How many plant species found outside tropical rain forests could be used in the treatment of cancer
B．Which plant has a product used for the treatment of anxiety
C．Worldwide, what is the total annual production of synthetic rubber
D．Which rain forest plant can be used for the treatment of eye disease

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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

Why does the author give his opinion of the definition of poetry

A．He doesn't want his readers to be confused
B．He wants to get to his point and not discuss definitions
C．Many people have tried to define it, and he wanted to add another by giving his point of view
D．He doesn't think the other definitions are accurate