痛觉()。
A.是机体受到伤害时产生的痛苦感觉
B.虽痛苦却对机体具有保护性的意义
C.的感受器分布在机体所有的组织中
D.的感受性是不会发生变化的
参考答案:A, B, C
He lives in a house which is close ____ a river. [ ]
A. by
B. to
C. with
D. from
The school days are busy enough, yet the Taylors try hard to fit as much as possible _____ their kids' lives. [ ]
A. in
B. into
C. on
D. at