问题
选择题
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
答案
答案：A
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。