A．China has delayed its purchasing plan because of the collision of a US spy plane and Chinese fighter jet last month
B．Boeing has got confirmation of the orders from Beijing
C．Boeing will not cut its production despite of its economic tension
D．China’s plan to purchase the planes appears to be on track

A．m. ______ in the United States every year.A. on the last Sunday of AprilB. on the first Sunday of AprilC. on the last Sunday of MayD. on the first Sunday of May