题目

Almost________ of the students in this class wear glasses, that is ________of them. A . two thirds; 60 percent B . two thirds; 60 percents C . two third; 60 percent D . two third; 60 percents 答案：A下列运算正确的是（ ）A.2a2·a3=2a6B.(3ab)2=6a2b2C.2abc÷ab=2D.3a2b+ba2=4a2b