HIV主要感染下列哪种细胞
A．CD4+T淋巴细胞B．B淋巴细胞C．单核细胞D．神经胶质细胞E．皮肤上皮细胞
参考答案：A
You must ______ to your sister for ____ so impolite.
[ ]
A. say sorry, is
B. say sorry, being
C. to say sorry, be
D. saying sorry, to be
Alu家族(Alu family)
