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．She’’s unable to attend the study session.B．She has seen a doctor recently.C．She’’s concerned about medical care.D．She mentions the need for some medical tests.
A．She’’s unable to attend the study session.
B．She has seen a doctor recently.
C．She’’s concerned about medical care.
D．She mentions the need for some medical tests.
单项选择题
A．Crowded air traffic.B．The large size of airplanes.C．Mistakes by air traffic controllers.D．Bad weather.
A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
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