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【单选题】
已知某消费者的效用函数为 U=3X × Y ,两种商品的价格分别为 PX =1 , PY =2 ,消费者的收入是 12 ,求均衡时消费者获得的最大效用。A.
50
B.
45
C.
63
D.
54
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皮皮学刷刷变学霸
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【多选题】一般认为,腰椎间盘突出症是在椎间盘退变的基础上发生的,随着年龄增长, 均可造成腰椎间盘突出
A.
髓核含水量减少
B.
纤维环变弱
C.
由于一次较重的外伤，或反复多次轻伤
D.
甚至一些日常活动使椎间盘压力增加时
【单选题】Why is drunken boating more dangerous than drunken driving?
A.
Because of the enjoyment of boating.
B.
Because of the terrible power and high speed.
C.
Because of the crowded waterways.
D.
Because of the lack of traffic regulations.
【单选题】Why have the public changed their opinion about drunken driving?
A.
Because drunken drivers are more conscious of their image.
B.
Because judges usually give more severe sentences to drunken drivers.
C.
Because detailed statistics on drunken slaughter are now available.
D.
Because they are no longer tolerant of the drunken slaughter.
【单选题】---- Drunken drive is dangerous, isn’t it? ---- Yeah. That why drunken drivers to prison even without causing accidents.
A.
sent
B.
are sent
C.
send
D.
are sending
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