单项选择题

Passage Two
Questions 29 to 32 are based on the passage you have just heard.

A．In 1928.
B．In 1982.
C．In 1980.
D．In 1920.
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填空题
The Grand Canyon is ______ (最宽外达两万四千米).
单项选择题
The pesticide DDT can be effective against ______.
A．malaria
B．wildlife
C．animals
D．human nervous system
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