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【单选题】
生物素-亲和素系统(BAS)的特点不包括A.
1个亲和素分子可以结合4个生物素分子起放大作用
B.
亲和生物素有极强的亲和力，起多级放大作用的特异性
C.
生物与抗体、酶、多聚核苷酸结合
D.
1个生物素分子可以结合多个亲和素分子起放大作用
E.
亲和与酶、铁蛋白、荧光素、核素结合
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【单选题】I didn’t expect to () my teacher in the street yesterday
A.
refer to
B.
wok with
C.
deal with
D.
run into
【单选题】—I didn’t expect that John would be absent from my last Sunday’s birthday party. —As far as I know, he ______ to see his parents in the countryside on Sundays.
A.
goes
B.
went
C.
has gone
D.
had gone
【单选题】— Does your brother serve in the army? — No, not now. But he _______ in the army for 8 years. [ ]
A.
would serve
B.
served
C.
had served
D.
was serving
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