My brother's birthday is May _____.[ ]
A. fifteen
B. fifty
C. fifteenth
D. fiftieth
答案:C
开放作文。
请根据下面提示,写一篇短文。词数不少于50。
In your spoken English class, your teacher shows you the following picture. You are asked to describe
the picture and explain how you understand it.
提示词:放大镜 magnifying glass
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PAP-ABC法()
A.把生物素耦联到特异性第一抗体上,将生物素化抗体直接和ABC复合物结合
B.先用PAP法,然后用ABC法
C.先用PAP法,后用LAB法
D.抗体亲和素-生物素-过氧化物酶复合物的一步法
E.HRP-多聚化合物-特异性抗体复合物一步法