单项选择题
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A.A lesson requires students’ active involvement.
B.Students usually take an active part in a lecture.
C.More knowledge is covered in a lecture.
D.There is a larger group of people interested in lessons.
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单项选择题
A.It was fashionable to wear them.B.They were inexpensive.C.They were a sign of wealth.D.It was important to be on time.
A.It was fashionable to wear them.
B.They were inexpensive.
C.They were a sign of wealth.
D.It was important to be on time.
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单项选择题
A.It affects the growth of trees.B.It has been increasing since the Ice Age.C.It is determined by the chemicals in the air.D.It follows a certain cycle.
A.It affects the growth of trees.
B.It has been increasing since the Ice Age.
C.It is determined by the chemicals in the air.
D.It follows a certain cycle.
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