They often play basketball _____ one hour _____ the morning _____ Saturday.[ ]

A. for; in; on

B. in; for; on

C. on; in; on

D. at; in; in

主要分布在夏季温暖、冬季严寒的地区，植物以松、杉为主，这是下列哪种植被的特点[ ]

A．针叶林

B．热带雨林

C．常绿阔叶林

D．草原