单项选择题
A．for at least 6 months in any one year B．all through the year C．for less than six months a year D．for up to six months
A．Amy has never recovered from the shock B．Amy changed her job after the accident C．Amy lost her memory after the accident D．Amy has lived quite a normal life
A．Two Important Tests on Airplanes B．The Importance of Flying Safely C．The Danger of Testing Airplanes D．How Airplanes Are Made and Tested