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【单选题】
Sally Garcia devotes all of her income to the consumption of two goods, apples and Reese's Peanut Butter Cups. She has just discovered that at her current level of consumption the marginal utility of an apple is 6 and the marginal utility of a Reese's Peanut Butter Cup is 8. Suppose the price of an apple is $0.10, while the price of a Reese's Peanut Butter Cup is $0.25. To maximize her total utility, assuming that the goods are divisible, she would:A.
consume more Reese's Peanut Butter Cups and fewer apples.
B.
consume less of both goods.
C.
consume more apples and fewer Reese's Peanut Butter Cups.
D.
There is not enough information to justify a change in her current level of consumption.
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【单选题】According to paragraph A, which is the function of the ozone layer?
A.
The ozone layer causes skin cancer.
B.
The ozone layer absorbs carbon dioxide.
C.
The ozone layer makes the sun rays become harmless.
D.
The ozone layer regulates the concentration of carbon dioxide.
【单选题】在螺栓联接的结构设计中，被联接件与螺母和螺栓头接触表面处需要加工，这是为了（ ）。
A.
不致损伤螺栓头和螺母
B.
增大接触面积，不易松脱
C.
防止产生附加偏心载荷
D.
便于装配
【单选题】在螺栓联接的结构设计中，被联接件与螺母和螺栓头接触表面处需要加工，这是为了（）。
A.
不致损伤螺栓头和螺母
B.
增大接触面积，不易松脱
C.
防止产生附加弯曲应力
D.
便于装配
【简答题】A．Ozone as a form. of oxygen. B．Problems caused by the thinning of the ozone layer. C．The origin of ozone problems. D．The latest studies of ozone problems.
【简答题】The ozone layer in the stratosphere______.
【简答题】The ozone layer(臭氧层) is a thin layer of gas around the earth. It forms a special “blanket” around the planet. This “blanket” protects the earth from erous rays produced by the sun. Without the ozo...
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