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A．It was in spring.B．It was in winter.C．It was in summer.D．It was in fall.

A. It was in spring.
B. It was in winter.
C. It was in summer.
D. It was in fall.

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A．It went out of use 300 years ago.B．It was invented after the short bow.C．It was disc

A. It went out of use 300 years ago.
B. It was invented after the short bow.
C. It was discovered before fire and the wheel.
D. It's still in use today.

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A．The quality of air.B．The number of trees.C．The lifecycle of trees.D．The intensity of

A. The quality of air.
B. The number of trees.
C. The lifecycle of trees.
D. The intensity of solar burning.

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Andrew Chi-chih Yao went to teach at Tsinghua University willingly just because he was paid much higher there.

A. Y
B. N
C. NG

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A．It follows a certain cycle.B．It affects the growth of trees.C．It has been increasing

A. It follows a certain cycle.
B. It affects the growth of trees.
C. It has been increasing since the Ice Age.
D. It is determined by the chemicals in the air.

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A．It was in spring.B．It was in winter.C．It was in summer.D．It was in fall.

A. It was in spring. B. It was in winter. C. It was in summer. D. It was in fall.

A．It went out of use 300 years ago.B．It was invented after the short bow.C．It was disc

A．The quality of air.B．The number of trees.C．The lifecycle of trees.D．The intensity of

Andrew Chi-chih Yao went to teach at Tsinghua University willingly just because he was paid much higher there.

A．It follows a certain cycle.B．It affects the growth of trees.C．It has been increasing

A. It was in spring.
B. It was in winter.
C. It was in summer.
D. It was in fall.