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【单选题】
机会成本是指由于资源的有限性,进行多方案比选时,选择了最优方案,放弃了次优方案,次优方案可能提供的( )即为选择最优方案的机会成本。A.
潜在收益
B.
实际成本
C.
实际收益
D.
计划成本
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皮皮学刷刷变学霸
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【单选题】南迦巴瓦峰是喜马拉雅山脉东端的最高峰，海拔7782米，雅鲁藏布江在此的一个Ω形转身，造就了这里罕见的高山峡谷地貌。南迦巴瓦峰比世界最高峰——珠穆朗玛峰纬度偏高约1.6°，但自然带谱的丰富性和完整性在我国境内绝无仅有，是我国不可多得的“自然博物馆”。下图示意南迦巴瓦峰和珠穆朗玛峰自然带分布。据此完成下列10-12题。【图片】与珠穆朗玛峰北坡相比，南迦巴瓦峰北坡自然带谱多的主要原因是
A.
山麓海拔低，气候垂直差异显著
B.
相对高度大，植物种类多
C.
所处纬度偏低，山体高耸陡峻
D.
临近河谷，水汽充足降水多
【单选题】This is what you should bear in mind: Don’t（ ）a salary increase before you actually get it.
A.
hang on
B.
draw on
C.
wait on
D.
count on
【单选题】Which of the following statements is NOT true?
A.
Many famous people in history were actually poor than the author.
B.
Napoleon never had a refrigerator with glass door.
C.
The rising and falling standard of living influences people's attitude towards their life.
D.
After a century or two, the banker's fancy counter tops will also be worthless stuff.
【单选题】The author seems to believe that status syndrome may be cured
A.
if the measures can actually weaken the relationship between social position and health.
B.
if the government shouts louder in their campaign against diseases resulting from unhealthy habits.
C.
if the government helps people find a stronger will power to give up their unhealthy habits.
D.
ff the government undertakes bigger and more effective ad campaigns against poor education.
【简答题】因的___较吗啡轻而且慢，故几乎取代吗啡用于各种锐痛
【单选题】Rebecca: ______ Dora: Really? Well, personally, I think he wears the wrong colors. Actually light colors don't really suit him.
A.
I don't think Bob has chosen the right suit.
B.
I love the way Bob dresses. He always looks so smart.
C.
How funny Bob looks in that jacket!
D.
Bob's new coat looks very expensive.
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