Although the conditions in which she chooses to live suggested that she is miserly (吝啬的), her contributions to worthwhile charities show that she is （）

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

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