单项选择题

Before the cherry-picking machine was invented, a present orchard worker’s one day’s work is equal to amount of work done by （）.

A．three hundred and fifty farmers a day
B．one hundred farmers two weeks
C．two hundred farmers two weeks
D．thousands of farmers a day

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单项选择题
African people used （） as money in ancient times.

A．cloth and knives
B．cows and other animals
C．copper coins
D．tusks, monkey tails and salt
填空题
A．bush B．must C．rub D．truck
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