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【多选题】
下面对资产组合分散化的说法错误的是（ ）。A.
分散化减少资产组合的期望收益，因为它减少了资产组合的总体风险
B.
适当的分散化可以减少或消除系统风险
C.
当把越来越多的证券加入到资产组合当中时，总体风险一般会以递减的速率下降
D.
当所有投资者的资产组合都充分分散化时，组合的期望收益由组合的市场风险解释
E.
除非资产组合包含了至少30只以上的个股，否则分散化降低风险的好处不会充分地发挥出来
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举一反三
【单选题】Roger did not stay long at the hotel because ______.
A.
it was forced to close down
B.
there were too many guests
C.
he was sued to living in the desert
D.
he wanted more time for reading
【单选题】听力原文：W: Roger, any problems in your Korean study? M: The biggest problem with me is the Korean vocabulary. It really makes me frustrated. The pronunciation and usage put me into great confusion as I k...
A.
He keeps forgetting the important things he has to do.
B.
He has great difficulty remembering Korean words.
C.
He can't find the most helpful Korean dictionary.
D.
His pronunciation of Korean words confuses others.
【单选题】During the test the boy chose to sit next to Stanley Plummer because ______ .
A.
obviously he and Plummer were good friends
B.
only Plummer would let him copy the correct answers
C.
the latter was smart and friendly to him
D.
he knew the latter was smart in math and he could copy his answers easily
【单选题】Roger chose to sit where Mrs. Jones ould easily see him ______.
A.
because he was afraid to make her angry
B.
because he did not want to be mistrusted
C.
so that she could concentrate on fixing the meal
D.
for no reason at all
【单选题】听力原文：W: Roger, any problems in your Korean study? M: The biggest problem with me is the Korean vocabulary. It really makes me frustrated．The pronunciation and usage put me into great confusion as l ke...
A.
He keeps forgetting the important things he has to do.
B.
He has great difficulty remembering Korean words.
C.
He can't find the most helpful Korean dictionary.
D.
His pronunciation of Korean words confuses others.
【单选题】将小写字母n赋值给字符变量one_char，正确的操作是 ______。
A.
one_char='n'
B.
one_char='n'
C.
one_char=110
D.
one_char='N'
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