题目

—Hey, your ring looks quite pretty. _______ it __________ of silver?   —Yes. And it ____________ Thailand.  A. Is, made, is made in                 B. Does, made, is made in C. Is, made, made in                   D. Does, make, make in 答案：A13．下列实验操作正确的是（　　）A．过滤B．检验氧气C．稀释浓硫酸D．测溶液的酸碱度