单项选择题

A．I should adopt many measures.
B．I should be careful.
C．The risk to me was almost nonexistent.
D．I could not visit my friend because it was dangerous.
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单项选择题
A．Type letters.B．Go back home.C．Give the man a hand.D．Talk to Mr. Mark.
A．Type letters.
B．Go back home.
C．Give the man a hand.
D．Talk to Mr. Mark.
单项选择题
A．An international tourist industry.B．Rise in sea levels.C．Greenhouse gases.D．Earthquakes and volcanoes.
A．An international tourist industry.
B．Rise in sea levels.
C．Greenhouse gases.
D．Earthquakes and volcanoes.
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