单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．$5.50.
B．$4.50.
C．$3.50.
D．$2.50.
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单项选择题
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.
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
A．They want to change the way English is taught.B．They learn English to find well-paid jobs.C．They want to have up-to-date knowledge of English.D．They know clearly what they want to learn.
A．They want to change the way English is taught.
B．They learn English to find well-paid jobs.
C．They want to have up-to-date knowledge of English.
D．They know clearly what they want to learn.
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