单项选择题

A．Self-improvement, A Search for Physical Fitness.
B．Different Forms of Self-improvement in America.
C．Self-improvement, A Good Way to Spend Leisure Time.
D．Adult Education and Self-improvement.
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单项选择题
According to the researchers, cream sours faster than butter because bacteria ________.
A．are more evenly distributed in cream
B．multiply more easily in cream than in butter
C．live on less fat in cream than in butter
D．produce less waste in cream than in butter
单项选择题
A．21 November 1980.B．12 December 1980.C．12 September 1980.D．12 November 1980.
A．21 November 1980.
B．12 December 1980.
C．12 September 1980.
D．12 November 1980.
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