单项选择题

A．Less than one year.
B．Four years.
C．Five years.
D．More than five years.
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单项选择题
A．To imitate it.B．To use it from time to time.C．To ask for it.D．To hear it.
A．To imitate it.
B．To use it from time to time.
C．To ask for it.
D．To hear it.
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.
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