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.
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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