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【单选题】
如果随着产量增加，生产函数首先表现出边际产量递增，然后表现出边际产量递减，那么，相应的边际成本曲线将A.
上方倾斜
B.
是U 形的
C.
下方倾斜
D.
平坦的(水平的)
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举一反三
【简答题】Why is it important to know how to take a good smart phone self-portrait? Because knowing how to take a good smart phone self-portrait has been ______________ for young people.
【简答题】What is the most useful self-portrait for most people? For most people, the most useful self-portrait is _______ .
【单选题】This portrait of self-destruction is told through the contrast of two singing sisters, one famous and one ______.
A.
historical
B.
responsible
C.
notorious
D.
illegal
【判断题】《自画像》(Self-Portrait)全名叫《一个头部和肩部朝向左边的三十岁左右的红胡子男人》(A head and shoulders portrait of a thirty something man with a red beard facing to the left)
A.
正确
B.
错误
【单选题】For most people, why is the headshot the most useful self-portrait?
A.
It can be used as a personal picture for social-media sites.
B.
People like Facebook and Twitter.
C.
It can be used by social-media sites like Facebook or Twitter.
D.
Facebook and Twitter like personal things.
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