有这样一句古语：子不教，父之过。这句话表明家庭具有[ ]
A．物质生产功能
B．人口生产功能
C．消费功能
D．教育功能
答案：D
—These days，he has stayed up late into night in order to get good marks in the following monthly test.
—It's no ________ that he seems tired and asleep in class every day.
A．wonder
B．problem
C．doubt
D．question
属于自备式导航系统的有（）。
A.WR，ATC，GPWS，RA.
B.TCAS，GPWS，V0R，ADF.
C.RA，WR，TCAS，GPWS.
D.V0R，ADF，ATC，D扎伍.
