属于血清凝集反应的有（）。
A.Widal试验
B.Weil-Felix反应
C.抗“O”试验
D.Elek试验
E.Ascoli试验
参考答案：A, B
—How do you think I can make up with Johnson?
—Set aside ________ you disagree and try to find ________ you have in common.
A．what; what
B．where; what
C．what; which
D．where; which
理解繁殖价值、亲本投资、繁殖成本的含义。
