题目内容

You will hear one word read from each group. Circle the correct one after listening and then read all the words correctly.

A. sing
B. sin
C. sill

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设随机变量X服从二项分布B(n,p),则随机变量Y=n-X服从的分布为______.

I ______ the cream from the milk. (skim, skin)

My mother never let me paint my ______. (nails, mail)

The next number is neither nine nor nineteen.

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