中熔铸造包埋材料中与凝固膨胀有关的成分是（）
A.石英
B.石膏
C.硼酸
D.磷酸盐
参考答案：B
—Guess what, we've got our visas for a short-term visit to the UK this summer. —How nice! You （）a different culture then.
A. will be experiencing
B. have experienced
C. have been experiencing
D. will have experienced
家庭与社会
