This is Jim’s room. It’s a nice room. Some pictures are on the wall (墙). There’s a desk and a chair in his room. There is a sofa and a bookcase, too. The desk is between (在……之间) the bed and the bookcase. His backpack and pencil case are on the desk. His pencils, pen and ruler are in the pencil case. His sofa is near the desk. His baseball is under the bed.

小题1: There is ______ in Jim’s room.

A. a desk and a sofa           

B. a desk and some chairs

C. a chair and some desks

小题2:The desk is between the _______ and the _______.

A. sofa; bookcase            

B. bed; bookcase

C. bed; sofa

小题3:Jim’s pencil case is _______.

A. on the desk                

B. under the desk

C. under the bed

小题4: Jim’s _______ isn’t in his pencil case.

A. pencil       B. pen      C. eraser

小题5: Jim’s _______ is under the bed.

A. pen       B. baseball     C. ruler

各种单克隆体抗体分子都有的特性是

A．分子量在10000以下 

B．具有两个完全相同的抗原结合部位 

C．H链与L链借非共价键相连 

D．能结合补体 

E．能产生沉淀反应