下列哪种酶阻塞性黄疸时一般不增高（）
A.γ谷氨酰转移酶
B.胆碱酯酶
C.丙氨酸氨基转移酶
D.碱性磷酸酶
E.亮氨酸氨基肽酶
参考答案：B
Many students comc from poor families and they ______ afford school lunches, so the government is trying to help them.[ ]
A. needn’t
B. shouldn't
C. can’t
D. mustn’t
为什么说配第在近代奠定了劳动价值论的基础？
