My mother asked me to buy several ________ eggs for the dinner party.
A. dozens
B. dozens of
C. dozen of
D. dozen
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On Thanksgiving Day _________ people take part in all kinds of celebrating activities in this city.
A. hundreds of million
B. millions of hundreds of
C. hundreds millions of
D. millions hundreds of
Americans eat as they actually need every day.
A. twice as much protein
B. twice protein as much
C. protein as twice much
D. much twice protein as
MapReduce适用于（）
A. 任意应用程序
B. 任意可以在Windows Server 2008上的应用程序
C. 可以串行处理的应用程序
D. 可以并行处理的应用程序
MapReduce自定义排序规则需要重写下列那项方法（）
A. readFields()
B. compareTo()
C. map()
D. reduce()
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