“羌笛何须怨扬柳，春风不度玉门关．”这里所说的“春风”指的是 [ ]
A．春季风
B．夏季风
C．秋季风
D．冬季风
答案：B
— What was the weather like yesterday?
— It was terrible. It rained so ___ that the people ___ went out. [ ]
A. hardly, hard
B. hardly, hardly
C. hard, hardly
D. hard, hard
血浆中含量最多、缓冲能力最强的缓冲体系是（）
A.Na+-Pr/H-Pr
B.Na2HPO4/NaH2PO4
C.NaHCO3/H2CO3
D.K2HP04/KH2PO4
E.KHCO3/H2CO3
