— Go for a picnic this weekend, OK?

— __________. I love getting close to nature.

A．Why not?

B．I’m afraid not.

C．I believe not.

D．I don’t think so.

能检出早早孕的妊娠诊断试验有

A．酶免疫法

B．放射免疫法

C．胶乳凝集抑制试验

D．胶乳凝集抑制稀释试验

E．胶乳凝集抑制浓缩试验