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【简答题】
已知椭圆的中心在原点，焦点在x轴上，长轴长是短轴长的2倍且经过点M（2，1），平行于OM的直线l交椭圆于A、B两点． （1）求椭圆的方程； （2）已知 e=(t，0)，p=λ( MA | MA | + MB | MB | ) ，是否对任意的正实数t，λ， e ? p =0 成立？请证明你的结论．
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【单选题】From the last paragraph of this passage, it can be concluded that Andrew Carnegie would agree that
A.
one must work hard to get somewhere in the world.
B.
one must be able to make a wise decision on investment.
C.
one must not die with a huge amount of money left unused.
D.
one must treasure the city where one has lived for all one's life.
【单选题】听力原文： Andrew Carnegie, known as the King of Steel, built the steel industry in the United States, and, in the process, became one of the wealthiest men in America. His success resulted in part from hi...
A.
His ability to sell the product and his policy of expanding business.
B.
His reputation as the King of steel.
C.
His founding of the steel industry in the United States.
D.
His creation of a global distribution network.
【单选题】The last paragraph suggests that
A.
people are not able to make important decisions when hungry.
B.
decisions made on an empty stomach may be unreasonable.
C.
people are less intelligent when they are hungry.
D.
people are more intelligent when they are hungry.
【单选题】People tend to make mistake when ____.
A.
they perform. several challenging tasks at a time.
B.
new messages are processed one after another
C.
their relationships with others are affected
D.
the tasks require little thought
【单选题】Which of the following is NOT true according to the passage?
A.
Andrew Carnegie became the wealthiest men in America by his hard work.
B.
Andrew Carnegie's noteworthy contributions to society are those that bear his name.
C.
Most Americans have benefited from Andrew Carnegie's generosity.
D.
Libraries donated by Andrew Carnegie formed the basis of the public library system.
【单选题】How many libraries have been established with the money donated by Andrew Carnegie?
A.
500.
B.
1500.
C.
2500.
D.
3500.
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