At present, number of students are near-sighted and, what’s worse, number of them is increasing.
A. a; the
B. a; a
C. the; the
D. the; a
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(答案→)A. a; the
B. a; a
C. the; the
D. the; a
解析：考查冠词。a number of 许多，the number of……的数目。句意：目前许多学生近视眼，而且数字在增加。