单项选择题

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

A．Mary is going to Hawaii.
B．Mary has been to many countries.
C．Mary likes postcards.
D．Mary is traveling on business.
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单项选择题
A．A web page authoring program.B．A kind of beverage.C．A computer game.D．A kind of software.
A．A web page authoring program.
B．A kind of beverage.
C．A computer game.
D．A kind of software.
单项选择题
According to the passage, land can be polluted by ______ from agriculture.
A．heavy metals
B．pesticides and nitrate-poor fertilizers
C．slurry from livestock
D．rubbish
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