马克思主义哲学之所以是科学的,就在于它坚持了[ ]
A.实践的观点
B.革命的观点
C.阶级的观点
D.历史的观点
答案:A
I'm glad to find that many trees ________ in our city last year. [ ]
A. plant
B. planted
C. were planted
D. are planted
风扇皮带有打滑的声音时,如检查皮带张力正常,可在皮带两边涂抹皮带蜡。