单项选择题

Many countries have adopted systems of （） education in the 20th century in order to promote the average level of education.

A. excellent
B. elaborate
C. complicated
D. compulsory

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单项选择题
Scientists believe that color blindness is a(n) （） defect, and there is no cure of it.

A. induced
B. original
C. primitive
D. inherited
单项选择题
（36）（）

A. to
B. for
C. in
D. with
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