【单选题】【消耗次数：1】
已知商品X的价格为3元，商品Y的价格为2元，如果消费者从这两种商品消费中得到最大效用时，商品Y的边际效用为30，那么此时X商品的边际效用为
①
75
②
55
③
60
④
45
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【判断题】
已知消费者的收入是100元，商品X的价格是10元，商品Y的价格是3元。假定他打算购买7单位X和10单位Y，这时商品X和Y的边际效用分别是50和18。如要获得最大效用，他应该增购X，减少Y的购买量
①
正确
②
错误
【单选题】
若消费者消费了两个单位某物品之后，得知边际效用为零，则此时( )。
①
消费者获得了最大平均效用;
②
消费者获得的总效用最大;
③
消费者获得的总效用最小;
④
消费者获得的总效用为负
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①
that
②
which
③
who
④
in which
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I am unhappy because she accepted my invitation _______ .
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passively
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extremely
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undoubtedly
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unwillingly
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So soon! I hope youve enjoyed it.
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Have a cup of tea.
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Not at all.
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How about a cup of coffee?
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more
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much
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better .
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most
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No thanks.
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No, it’s not so good.
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I’m glad you like it.
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Please don’t say so.
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Everybody likes her because she is always _______ .
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cheerful
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sad
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selfish
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beginning
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finishing
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first
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final
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①
appreciated
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approved
③
appealed
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applied