单项选择题
Questions 14 to 16 are based on the conversation you have just heard.
A．Bad weather. B．Human error. C．Breakdown of the engines. D．Failure of the communications system.
A．Trim the apple trees in her yard. B．Pick up the apples that fell in her yard. C．Take the garbage to the curb for her. D．Remove the branches from her yard.
A.affiliated B.attached C.contact D.contend E.continuous F.diminish G.endurance H.foster I.hazardous J.improved K.instantaneous L.intrinsic M.relatively N.shift O.similarly