单项选择题

The hard, out surface of the tooth is called enamel.()

A.outside
B.appearance
C.outer
D.hiding

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单项选择题
Just last week, for example, the World Health Organization (WHO) announced the disturbing disclosure that SARS may be pretty deadlier than previously believed.()

A.very
B.far
C.especially
D.none

单项选择题
Not much people realize that apples have been cultivated for over 3,000 years.()

A.Not many
B.Not enough
C.Without many
D.No many

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