单项选择题




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单项选择题
John can mow a field in 6 hours.Bill can mowa field in 5 hours.Henry can mow a field in 4 hours.Joe can mowa field in 3 hours.Tomcan mowa field in 2 hours.If they all work together at their respective rates, how long will it take to mow the field
A．1.4 minutes
B．39.4 minutes
C．40.4 minutes.
D．38.4 minutes.
单项选择题
Why does the article advise people to look at prize-winning books
A．To copy the author’s style.
B．To realise what a high standard needs to be reached.
C．To get an idea of what might be successful.
D．To find out how to trick publishers.
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