单项选择题

A．The soil has been overworked.
B．The climate is cold.
C．The weather is too dry.
D．The soil is sandy.
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单项选择题
A．At 10 in the evening.B．At 9 in the evening.C．At 9 in the morning.D．At 10 in the morning.
A．At 10 in the evening.
B．At 9 in the evening.
C．At 9 in the morning.
D．At 10 in the morning.
单项选择题
A．4,000 years ago.B．3,000 years ago.C．2,000 years ago.D．1,000 years ago.
A．4,000 years ago.
B．3,000 years ago.
C．2,000 years ago.
D．1,000 years ago.
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