正常胰腺每天分泌胰液量
A.500~750ml
B.750~1500ml
C.1000~2000ml
D.1500~2500ml
E.<500ml
参考答案:B
It is better to teach a man how to fish than ____________ him fish.
A.to find
B.offer
C.to give
D.provide
强化物不一定是令人愉快的刺激。 ( )