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【单选题】
My father is()than my mother.A.
three years older
B.
older three years
C.
three years old
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反馈参考答案：
举一反三
【单选题】Compared with convenience goods, which of the following is NOT true of specialty goods?
A.
Specialty goods are designed only for the rich
B.
Specialty goods are usually bought at a higher price
C.
Specialty good are usually bought less often
D.
Specialty goods are often bought after comparison with competing brands.
【简答题】是我国现存最大的木构大殿,它的一切构件均属最高级。
【简答题】Her specialty is heart surgery.
【简答题】设二维随机变量(ζ,η) 的联合概率密度函数是 , 则关于 ζ 的边缘分布函数 = _________________ 。
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