How many ______________ are there in the picture?[ ]
A. a bus
B. buses
C. bus
D. some bus
答案:B
Have a drink?” “No thanks, _____.”
A.I do mind
B.I don’t like it
C.Never mind
D.I’d rather not
定量测定血小板抗体的方法是()。
A.免疫荧光技术
B.简易致敏红细胞血小板血清学实验。
C.单克隆抗体免疫固定血小板抗原方法
D.淋巴细胞毒试验
E.分子生物学方法