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【多选题】
曾经铝被认为是极其稀有的贵重金属,价格远远高于黄金,原因是:A.
电解法提炼，需要消耗大量的电能
B.
铝元素在地球上的含量太少
C.
人们太喜欢铝制品了
D.
氧化铝的熔点非常高
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举一反三
【单选题】Scarcity exists because
A.
society and people are greedy and wasteful.
B.
our wants exceed the resources available to satisfy them.
C.
of the inefficient choices we make.
D.
poor people need more food and other goods.
【简答题】下列有关主观判断法的说法正确的有（ ）。
【简答题】关于修正久期的说法正确的有（ ）。
【简答题】下列有关作业成本法的说法正确的有（ ）。
【简答题】下面关于司法的说法正确的有（ ）。
【简答题】下列有关供给法则的说法正确的有（ ）。
【单选题】Peter: ________ has he lived in China?Susan: He has lived here for two years.
A.
How long
B.
How soon
C.
How much
【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.
【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.
【单选题】Scarcity exists because of:
A.
the allocation of goods by prices.
B.
specialization and division of labor.
C.
the market mechanism.
D.
unlimited wants and limited resources.
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