生地黄的主治证是（）。
A.热入营血身热神昏
B.血热吐衄便血
C.阴虚内热骨蒸
D.津伤口渴，内热消渴
E.肠燥便秘
参考答案：A, B, C, D, E
介导适应性体液免疫应答的细胞是（）
A.单核细胞
B.巨噬细胞
C.中性粒细胞
D.B淋巴细胞
E.自然杀伤细胞
Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.
A.at work，only
B.in his or her berthing area，only
C.BOTH at work and in his or her berthing area
D.None of the above
