单项选择题

In fact, it has just a history of （）

A．less than two hundred years
B．more than a hundred years
C．less than a century
D．nearly a century

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单项选择题

21（）

A．sleep
B．bad
C．cold
D．sick

单项选择题

The best title for this passage is（）

A．Science, New Technology and Agriculture
B．Development of Science and New Technology Has Improved Agriculture
C．Orchard Workers Are Interested in the Development of Science and New Technology
D．Science and New Technology Can Enrich a Country