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【单选题】
初次应答时,B淋巴细胞活化的第2信号产生主要是A.
BCR识别抗原肽-MHC-I类分子复合物
B.
BCR识别抗原肽-MHC-Ⅱ类分子复合物
C.
B细胞上的CD40与Th细胞上的CD40L结合
D.
B细胞上的B7与Th细胞上的CD28相结合
E.
BCR与抗原结合
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【简答题】执行下面的程序段后，s的值为（）。
【单选题】The flat tax intends to do away with the complicated tax code and tax form. in the United States.
A.
Y
B.
N
C.
NG
【简答题】在罗马神话当中，地位最高的神是：()
【简答题】《论衡》全书 篇。
【单选题】Which of the following statements correctly describes the relationship between the size of the deadweight loss and the amount of tax revenue as the size of a tax increases from a small tax to a medium...
A.
Both the size of the deadweight loss and tax revenue increase.
B.
The size of the deadweight loss increases, but the tax revenue decreases.
C.
The size of the deadweight loss increases, but the tax revenue first increases, then decreases.
D.
Both the size of the deadweight loss and tax revenue decrease.
【单选题】Value added tax is an example of which kind of tax?
A.
Unit tax
B.
Ad Valorem tax
C.
Direct tax
D.
Income tax
【单选题】Value added tax is an example of which kind of tax?
A.
Indirect tax
B.
Capital gains tax
C.
Direct tax
D.
Income tax
【单选题】What is a 'progressive tax'? A 'progressive tax' is the tax ______.
A.
collected for social progress
B.
that increases with each passing year
C.
that is collected from those who earn most
D.
that varies (变化) according to how much money a person earns
【简答题】执行下面的程序段后，s的值为（）。
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