单项选择题

Questions 20 to 22 are based on the conversation you have just heard.
（）

A．Current issues in economics.
B．Choices faced by conservationists.
C．A recent biology lecture.
D．Topics for a research paper.

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单项选择题

A．It will mainly benefit the wealthy.B．It will stimulate business activities.C．It will reduce government revenues.D．It will cut the stockholders’ dividends.

A．It will mainly benefit the wealthy.
B．It will stimulate business activities.
C．It will reduce government revenues.
D．It will cut the stockholders’ dividends.

单项选择题

Norman Borlaug won a Nobel Prize for （）

A．his remarkable achievements in plant genetics
B．his spectacular contribution to safeguarding world peace
C．his great success in raising Africa’s food production
D．his enduring efforts in combating world hunger

Questions 20 to 22 are based on the conversation you have just heard. （）

Questions 20 to 22 are based on the conversation you have just heard.
（）