I hear____ boys in your school like playing football in their spare time,though others prefer basketball.

A．quite a few

B．quite a lot

C．quite a bit

D．quite a little

单克隆抗体有那些优点：（）

A.提供无限量的完全相同的抗体

B.专一性好，不会释放或含有可能引起假阳性结果的抗体

C.不会释放病毒

D.价格昂贵