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【单选题】
已知消费者收入为200元,商品X的价格为20元,商品Y的价格为6元,假设他打算购买7单位的X和10单位的Y,这时商品X和Y的边际效用分别为50和18,要获得最大效用,他应该( )A.
停止购买
B.
增加购买X，减少购买Y
C.
增加购买Y，减少购买X
D.
同时增加购买X和Y
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【简答题】She loves parties so much that she is always the last (leave)______.
【单选题】Jessica has always been honest and straightforward, and it doesn’t matter ________ that she’s talking to. [ ]
A.
who is it
B.
who it is
C.
it is who
D.
it is whom
【单选题】垄断厂商通过对小批量购买的消费者收取额外价格，侵蚀了一部分消费者剩余，得到更多的利润，这种对小批量消费者收取额外价格的行为属于（ ）。
A.
一级价格歧视
B.
二级价格歧视
C.
三级价格歧视
D.
四级价格歧视
【简答题】The girl was very sure of herself. She is always ______ (confidence)that she is right.
【单选题】She always thought that he was a stupid boy, so she was always ____ patience with him. [ ]
A.
out of
B.
in
C.
out
D.
of
【单选题】She always finishes her homework on time. She _____ leaves it for tomorrow. [ ]
A.
always
B.
never
C.
usually
D.
sometimes
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