单项选择题

Questions 26 to 29 are based on the passage you have just heard.

A．Because there are no plants.
B．Because there are no human beings.
C．Because there is no air.
D．Because there are no animals.
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单项选择题
A．She began to like it more after learning more.B．She will major in organic chemistry.C．It was difficult to learn everything.D．She got better grades at the end of the class.
A．She began to like it more after learning more.
B．She will major in organic chemistry.
C．It was difficult to learn everything.
D．She got better grades at the end of the class.
单项选择题
A．Twice.B．Three times.C．Six times.D．Seven times.
A．Twice.
B．Three times.
C．Six times.
D．Seven times.
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