单项选择题

Questions 19 to 22 are based on the conversation yon have just heard.

A．Because there is an excellent bus service.
B．Because there is an excellent railway service.
C．Because there is an excellent subway system.
D．Because taxi system there isn’t convenient.
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单项选择题
A．English.B．Biology.C．Introduction to English Literature.D．A required course.
A．English.
B．Biology.
C．Introduction to English Literature.
D．A required course.
单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of energy resources.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 energy resources.
D．The spread of the black powder from the fires.
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