题目内容

Thingsare gettingbetter and betterwhentimegoes on.ABCD

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Joansangwhileshe walkedalong,witha book in her left hand.ABCD

Jackwas washingdishesthenMaryknockedat the door and entered.AB CD

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株高是一项重要的农艺指标。现有3个不同品种的大豆,每个品种分别随机测量5株,总的自由度为()

A. 14
B. 3
C. 4
D. 2