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胎产式E．

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A．When they learnt how to keep animals in herds.B．When they had to go about from place

A. When they learnt how to keep animals in herds.
B. When they had to go about from place to place for food.
C. Before they learnt how to plant crops.
D. When they finally learnt the art of farming.

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【B15】

A. prospective
B. past
C. present
D. current

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Only some of the teenagers say that they have good judgment when they don't.

A. Y
B. N
C. NG

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【B8】

A. in
B. at
C. by
D. on

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