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.
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单项选择题
A．They’’ll keep in touch during the summer vacationB．They’’ll hold a party before the summer vacationC．They’’ll do odd jobs together at the school libraryD．They’’ll get back to their school once in a while
A．They’’ll keep in touch during the summer vacation
B．They’’ll hold a party before the summer vacation
C．They’’ll do odd jobs together at the school library
D．They’’ll get back to their school once in a while
单项选择题
A．To attend a conference.B．To see the planetarium.C．To change planes.D．To go sightseeing.
A．To attend a conference.
B．To see the planetarium.
C．To change planes.
D．To go sightseeing.
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