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
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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
Here are about some statements about American people’s general attitude towards the government. Which one is correct（）
A. Business should be fully regulated by the government
B. The government should not intervene in business in whatever way
C. Americans sometimes distrust the motives of business people and they think the government should be involved in part in the business, but not too much
D. Business, like public affairs, should be mainly regulated by the government
What led to the equality according to family researchers（）
A. Social revolution
B. Economic depression
Cultural changes
D. Political reform
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