单项选择题

Many economists have given in to the fatal lure of mathematics.()

A. simplicity
B. attraction
C. power
D. rigor

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单项选择题

Enamel,the hardest substance in a human being's body,covers the entire crown of the tooth.()

A. whole
B. inseparable
C. superficial
D. main

单项选择题

The study also notes a steady decline in the number of college students taking science courses.()

A. relative
B. general
C. continuous
D. sharp

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