能阻碍血红蛋白携O2，但不阻碍氧合血红蛋白释O2的是
A．酸度增加B．CO中毒C．Hb的Fe2+氧化成Fe3+D．低氧
参考答案：C
苏木的性状特征是（）
A.呈长圆柱形或对剖半圆柱形
B.表面黄红色或棕红色，具刀削痕
C.横切面略具光泽，年轮明显
D.可见质松、带亮星的髓部
E.无臭，味微涩
— How dangerous it was!
— Yes. Without your timely warning, the sweater _____ in the wash. [ ]
A. was shrunk
B. would have shrunk
C. had shrunk
D. should be shrunk
