选择适当的连接词 that, which , who填空。

1. That is the book          I bought yesterday.

2. Is he the person          you met outside the school gate yesterday?

3. I know the movie        you talked about last night.

4. He doesn't want the watch           is on the second shelf.

5. Do you like people         often think about themselves?

用于B淋巴细胞功能检测的试验有 （）

A.反向溶血空斑试验

B.酶联免疫斑点试验

C.形态法

D.放射性核素法

E.MTT法