下列哪种物质专一地抑制Fo因子？（）
A、鱼藤酮
B、抗霉素Ａ
C、寡霉素
D、苍术苷
参考答案：C
My uncle's house in the downtown area is much smaller than ours，but it is twice________expensive.
A．as
B．so
C．too
D．very
芥菜型，甘蓝型油菜的菌核病比白菜型油菜发病轻
