单项选择题

A．6.
B．8.
C．14.
D．A few times.
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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．By judging to what extent they can eliminate the risks.B．By estimating the possible loss of lives and property.C．By estimating the frequency of volcanic eruptions.D．By judging the possible risks against the likely benefits.
A．By judging to what extent they can eliminate the risks.
B．By estimating the possible loss of lives and property.
C．By estimating the frequency of volcanic eruptions.
D．By judging the possible risks against the likely benefits.
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