结核病患者膳食中优质蛋白质应占蛋白质总量的比例为（）
A.＜1/4
B.＜1/3
C.1/3～2/3
D.1/3～3/4
E.＞3/4
参考答案：C
28g铁与足量的盐酸完全反应后，生成的H2在标准状况下的体积为多少？
As we all know, it is usually cold in this place in January, but it _____ be warm sometimes.
A．must
B．can
C．should
D．would
