题目内容
The child sat on his mother’s ______. (nap, lap)
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Read the following tongue twisters. A lusty lady loved a lawyer and longed to lure him from his laboratory.
Fill in the blanks with the given words in the brackets. After listening, imitate reading all the sentences. He doesn’t want to ______. (sin, sing)
You will hear one word read from each group. Circle the correct one after listening and then read all the words correctly.
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______．
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