单选题
英语六级
2017-03-12
A．Salaries are quite low in middle-class families.
B．Manual labor is highly respected in the US.
C．Exercise is very important for mental labor.
D．People have various hobbies in the US.
参考答案
B
答案解析
What does the example of the professional's family serve to show? B。
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A．By searching the network siteS.
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D．By consulting computer companies.