单项选择题


Questions 15 to 18 are based on the passage you have just heard.
How many years did the Civil War last

A．Four years.
B．Five years.
C．Three years.
D．Six years.
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单项选择题
What were the scientists worried about soon after the Gulf War
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
单项选择题
What reason is given for Jane’s not teaching
A．She is tired of teaching.
B．She was dismissed from her job.
C．She’s changing jobs.
D．The school is too hot.
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