农民利用宅基地建造的住房登记，应缴纳房屋登记费（）元。
A.0
B.10
C.80
D.550
参考答案：A
15. —Why is Mr. Li so happy this morning?
—Because he was honored with a(n) ____ for excellence in teaching.
A．present
B．gift
C．award
D．Reward
往复式压缩机（）弯曲过大，造成泄漏和磨损。
A、连杆
B、曲轴
C、狮子头销
D、活塞杆
