同一时期的收入抵减费用的结果，即形成这一时期的利润。()
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The word "varied" in line 2 could best be replaced by ______.
A. increased
B. differed
C. returned
D. started
According to the passage, one important change in United States education by the 1920's was that ______.
A. most places required children to attend school
B. the amount of time spent on formal education was limited
C. new regulations were imposed on nontraditional education
D. adults and children studied in the same classes
According to the passage, early-twentieth-century education reformers believed that ______.
A. different groups needed different kinds of education
B. special programs should be set up in frontier communities to modernize them
C. corporations and other organizations damaged educational progress
D. more women should be involved in education and industry
To "live a completely sedentary life-style" (Line 8, Paragraph 1 ) in the passage means ______.
A. to "live an inactive life"
B. to "live a decent life"
C. to "live a life with complete freedom"
D. to "live a life of vice"
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