Playing a sport is _____ more than feeling tired. There are _____ effects that you feel after you play it. [ ]

A. few; some

B. less; many

C. little; a lot of

D. much; many

对于精密的设备则采用防振结构基础，其基础利用具有一定（）物质来缓解或减少来自振源的振动。

A.刚性

B.弹性

C.韧性

D.远离振源