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【简答题】
如图所示，直线AB、CD相交于点O，∠DOE=∠BOF= 90°，找出图中相等的角，并说明理由。
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举一反三
【单选题】The fact that the fourth plate from the All You Can Eat Country Buffet generated more satisfaction than the fifth plate is an example of
A.
increasing marginal utility.
B.
diminishing marginal utility.
C.
diminishing total utility.
D.
the paradox of value.
【单选题】All the fruit is free. You can eat ________.
A.
as few as possible
B.
as much as possible
C.
as much as you can
D.
Both B and C
【单选题】You go to an all-you-can-eat buffet. If you maximize utility, the marginal utility of the last bite that you eat will be:
A.
. equal to the price of the buffet.
B.
. as high as possible.
C.
. zero.
D.
. dependent on how much you like the buffet.
【单选题】All the fruit is free. You can eat_____ [ ]
A.
as many as possible
B.
as much as possible
C.
as many as possibly
D.
as much as possibly
【单选题】— Are you sure we can eat this with our hands? — Why not ? All of these people eat this way. You know, ______ . [ ]
A.
many hands make light work
B.
when in Rome , do as the Romans do
C.
Rome wasn't built in a day
D.
All roads lead to Rome
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