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【单选题】
补体是一组具有酶样活性的球蛋白，包括30余种可溶性蛋白和膜结合蛋白，故称补体系统。补体激活途径有3种，即经典途径、替代途径和MBL途径，其主要作用是清除抗原，不论其是否结合抗体。与抗原结合从而激活补体的经典激活途径的抗体主要是（）A.
IgG或IgM
B.
IgG或IgA
C.
IgM或IgA
D.
IgA或IgE
E.
IgE或IgM
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【单选题】There is _____ like the taste of a glass of cold milk-it has been described as the perfect food by westerners. [ ]
A.
something
B.
anything
C.
nothing
D.
everything
【单选题】听力原文：W: What's all this glass doing on the floor? M: Look at the window and you'll see. The kids were playing basketball and Tommy failed to catch it. Q: What do we learn from the conversation? (3)
A.
Tommy fell to the ground and broke his glasses.
B.
The window was broken by the kids.
C.
The kids were playing with the glasses.
D.
Tommy failed in the basketball game.
【单选题】下列的市场类型中,对厂商数目的排序正确的是( )
A.
完全竞争>寡头垄断>垄断竞争
B.
垄断竞争>寡头垄断>完全垄断
C.
寡头垄断>垄断竞争>完全竞争
D.
完全垄断>寡头垄断>完全竞争
【简答题】生命的基本特征是 、 、 、和 。
【简答题】SQL
Server 2016 是一个( )的数据库系统。 A:网状型;B:层次型;C:关系型;D:以上都不是;A. 网状型 B. 关系型 C. 层次性 D. 非关系型
【单选题】During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
A.
the highest
B.
above 3/4
C.
1/2 -3/4
D.
the lowest
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