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【单选题】
Choose the correct statements. 1.Opportunity cost of a good is the increase in the quantity produced of one good divided by the decrease in the quantity produced of another good as we move along the PPF. 2.The opportunity cost of an action is the highest-valued alternative forgone. 3.Opportunity cost is a ratio. 4.There is no relationship between the opportunity cost of producing an additional good measured on the x-axis and the opportunity cost of producing an additional good measured on the y-axis.A.
Statements 1 and 3 are correct.
B.
Statements 1 and 2 are correct.
C.
Statements 2 and 3 are correct.
D.
Statements 2 and 4 are correct.
E.
Statements 3 and 4 are correct.
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于km值叙述正确的是:
A.
km值可以表示酶与底物的亲和力，km值愈大，酶与底物的亲和力越大
B.
km值等于酶促反应速度为最大反应速度一半时的底物浓度
C.
km值不是酶的特征性常数
D.
同工酶的km相同
E.
作用底物改变，km值不变
【单选题】They climbed rocks, _____rivers and settled in the valley.
A.
across
B.
crossing
C.
crossed
D.
and crossing
【简答题】The example of crossing the street shows that the middle school boy is ______.
【多选题】已知文法G(E) : E→T|E+T T→F|T *F F→(E)|i 句型T+T * F + i的直接短语有:
A.
T
B.
T+T*F
C.
T+T*F+i
D.
T*F
E.
i
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