题目

I want to buy that kind of cloth because I ______ the cloth ______ well.        A. have told; washes             B. have been told; washes        C. was told; washed              D. have been told; is washed 答案：B下列函数中在其定义域上是偶函数的是     A. y＝2    B. y＝x    C. y＝x    D. y＝x