单项选择题

A．Has never been to his friend’’s house.
B．Has been to his friend’’s house before.
C．Used to go to his friend’’s house a lot.
D．Often goes to his friend’’s house.
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单项选择题
A．Other living things change their environment while man doesn’’t.B．Man alters his environment while he is adapted to it, but other living things do not.C．Other living things is not only adapted to their environment but also alters it.D．Man is only adapted to the environment but he doesn’’t alter it.
A．Other living things change their environment while man doesn’’t.
B．Man alters his environment while he is adapted to it, but other living things do not.
C．Other living things is not only adapted to their environment but also alters it.
D．Man is only adapted to the environment but he doesn’’t alter it.
单项选择题
A．Taking the air.B．By plane.C．On radio and TV.D．At the airport.
A．Taking the air.
B．By plane.
C．On radio and TV.
D．At the airport.
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