用高压锅烧水,拧紧锅盖后水温缓慢上升,在水烧开前,锅内水的 ( )
A:体积变小
B:内能变大
C:密度变大
D:比热容变小
—How is your grandma?
—She is fine. She used to____ TV at home after supper. But now she is used to____out for a walk.
欧洲西部畜牧业发达的主要原因是( )