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【单选题】
某工厂为检查流水线生产的产品质量,每隔 4 小时,抽取 5 分钟生产的全部产品进行检查。这种抽样方式属于 __________A.
纯随机抽样
B.
整群抽样
C.
两阶段抽样
D.
分层抽样
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举一反三
【单选题】After a long hard training, the athlete decided that he was going to _______the existing world record set by someone else.
A.
challenge
B.
spoil
C.
distinguish
D.
achieve
【单选题】After months of hard training, Jim is now well on the way to ____ his pilot's license.
A.
maintaining
B.
maintain
C.
attaining
D.
attain
【简答题】Their bodies were hard and m________ after much training.
【单选题】After hard training for a long time, Liu Xiang ______ the records again. [ ]
A.
broke
B.
achieved
C.
invented
D.
completed
【单选题】After months of hard training, Jim is now well on the way to ___________his pilot's license. (Para. 5)
A.
maintaining
B.
maintain
C.
attaining
D.
attain
【单选题】After hard training for a long time, Lucy the records again.
A.
broke
B.
achieved
C.
invented
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