轴流式通风机可以利用（）反风。
A、反风道
B、备用风机的风道
C、反转
D、改变电动机转转速
参考答案：A, B, C
My aunt is a writer. She _______ more than ten books since 1980.[ ]
A. writes
B. wrote
C. has written
D. will write
古人造字意蕴深远，“伪”者“人为”也。“伪”字的造字意蕴最能体现哪家学派思想（）
A.道家
B.儒家
C.墨家
D.法家
