题干
—Have you ever been to abroad as an exchange student(交换生)?
—No, I haven't.
A：to a big city
B：to a foreign country
C：to a different school
答案(点此获取答案解析）
B
—Have you ever been to abroad as an exchange student(交换生)?
—No, I haven't.
A：to a big city
B：to a foreign country
C：to a different school
、
、
和
四种溶液（不考虑他们之间的相互反应）的试剂组是 （ ）