单项选择题

A．Always.
B．Once.
C．Twice.
D．Three times.
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单项选择题
A．The distance-learning course is free of charge.B．The distance-learning course is taught by professors overseas.C．There is no regular class in the distance-learning course.D．There is no exam in the distance-learning course.
A．The distance-learning course is free of charge.
B．The distance-learning course is taught by professors overseas.
C．There is no regular class in the distance-learning course.
D．There is no exam in the distance-learning course.
单项选择题
A．They published scientific evidence to determine second hand smoke as a cause of cancer.B．They denied the suspicion that second hand smoke may cause cancer.C．They discovered all the causes of cancer.D．They agreed that moderate smoke won’t cause cancer.
A．They published scientific evidence to determine second hand smoke as a cause of cancer.
B．They denied the suspicion that second hand smoke may cause cancer.
C．They discovered all the causes of cancer.
D．They agreed that moderate smoke won’t cause cancer.
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