单项选择题

A．They were given the food prepared in an infected country.
B．Some of the victims spread the disease among the passengers.
C．All of the victims had contracted the disease before boarding.
D．They themselves were not strong enough to resist the infection.
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单项选择题
A．Speed limits are the same in all areas.B．She’’d told him what it was.C．There are signs along the road.D．He has recently received his driver’’s license.
A．Speed limits are the same in all areas.
B．She’’d told him what it was.
C．There are signs along the road.
D．He has recently received his driver’’s license.
单项选择题
A．Dr. Philips and his book on plagues.B．Old diseases on the comeback and the reasons.C．Diseases and their battles against human’’s control.D．Cholera, its death and its revival.
A．Dr. Philips and his book on plagues.
B．Old diseases on the comeback and the reasons.
C．Diseases and their battles against human’’s control.
D．Cholera, its death and its revival.
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