中度营养不良患者的血清清蛋白含量为
A.低于20g/L
B.21~ 27g/L
C.28—34g/L
D.35—38g/L
E.大于38g/L
参考答案:B
While the alien _______ a souvenir, the girl called the police.[ ]
A. was buying
B. bought
C. buys
D. is buying
大市场营销的手段与市场营销的手段是相同的。