One aspect of the American dream is to rise from poverty to modest wealth to great wealth. In the United States, this has usually been accomplished____（）
A. through successful academic careers
B. through successful farming
C. through successful business careers
D. with the help of the government
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Which of the following options was the epoch of tycoon in the “Gilded Age” of the second half of the 19th century（）
A. Bill Gates
B. Samuel Slater
C. John D. Rockefeller
D. Alexander Hamilton
In the colonial days, what had held back the development of economy（）
A. the abundance of land and scarcity of labor
B. inadequate slaves
C. heavy taxes
D. people’s reluctance to accept new technology
Which of the following options belongs to business enterprise（）
A. Churches
B. Charities
C. Wal-Mart
D. Educational institutions
以下HDFS相关的shell命令不正确的是（）
A. hadoop fs -ls ：显示指定的文件的详细信息
B. hadoop dfs mkdir ：创建指定的文件夹
C. hadoop fs -copyFromLocal ：将路径指定的文件或文件夹复制到路径指定的文件夹中
D. hdfs dfs -rm ：删除路径指定的文件
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