根据《电力法》的规定，农业用电价格按照（）的原则确定。
A.财政补贴电价亏损
B.保本
C.保本微利
D.完全市场竞争
参考答案：C
It _____ six years since his grandfather died.[ ]
A. is
B. was
C. had been
D. will be
什么是林木种实害虫？有哪些共同特点？
