单项选择题

A．It’s a common disease.
B．It’s both mystifying and frightening.
C．It’s easy to cure.
D．Only animals catch AIDS.
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单项选择题
A．To continue to wait.B．Tc leave immediately.C．To seek their friend.D．To give a call to their friend.
A．To continue to wait.
B．Tc leave immediately.
C．To seek their friend.
D．To give a call to their friend.
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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