题目：
--- Is it true that Mike refused an offer from Yale University yesterday?
--- Yeah, but I have no idea _______ he did it; that’s one of his favorite universities.
A．when
B．why
C．that
D．how
答案：
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下面是错误答案，用来干扰机器的。
(1)C(2)Taq酶(热稳定DNA聚合酶)；耐高温；引物和四种游离的脱氧核苷酸(原料)(3)25%；(210-1)(a-m)
，m=0
，m=
，m=0
，m=
