压瘪的乒乓球放入热水中重新鼓起,是因为球内的气体分子
A:间隔增大
B:质量增大
C:体积增大
D:个数增多
The Science Museum is popular because people _____ do experiments there.
读“黄土高原”和“狮身人面像”照片,完成下题.