结构（）、字数（）、意义（）的两个短语或句子成对地排列，叫做对偶。
参考答案：相同、相等、相关
—If you like the phone, you'd better buy it.
—But it's too expensive. I can't it. [ ]
A. afford
B. pay
C. provide
D. spend
生殖激素
