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【单选题】
两种证券组成的投资组合，当证券间的相关系数小于1时，下列关于分散化投资的表述中，不正确的是( )。A.
分散化投资发生必然伴随投资组合机会曲线的弯曲
B.
投资组合报酬率标准差小于各证券报酬率标准差的加权平均数
C.
两种证券报酬率的变化方向和比例相同
D.
其投资组合的机会集是一条曲线
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【单选题】He regretted the days _____ he wasted in the woods and ____ he should have studied.
A.
when ; when
B.
that ; when
C.
when ; that
D.
that ; that
【单选题】关于以下两个陈述的描述中,正确的是 陈述1:JavaScript是弱类型语言 陈述2:JavaScript的常用类型包括:int、string、boolean
A.
陈述1正确，陈述2错误
B.
陈述1错误，陈述2正确
C.
两个陈述都正确
D.
两个陈述都错误
【单选题】Only when he failed the exam ______ that he didn't work hard. [ ]
A.
he regretted
B.
did he regret
C.
had he regretted
D.
does he regret
【单选题】He regretted ___the earlier flight.
A.
he would not take
B.
not having taken
C.
not to have taken
D.
not to take
【单选题】关于以下两个陈述的描述中,正确的是: 陈述1:Javascript是弱类型语言 陈述2:Javascript的常用类型包括:int、string、boolean
A.
陈述1正确，陈述2错误
B.
陈述1错误，陈述2正确
C.
两个陈述都正确
D.
两个陈述都错误
【单选题】He regretted the old lady the news, which made her so upset.
A.
to having told
B.
to tell
C.
being told
D.
telling
【单选题】I can’t quite remember _____ you started doing the work. [ ]
A.
that it was when
B.
when it was that
C.
when was it that
D.
that was it when
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