— Can you guess _______ the new Nike sports shoes?

—Yes, maybe he asked his grandpa for the money, I think.

A．how he paid for

B．where he bought

C．when he paid for

D．why he bought

为了保证“神舟”七号发射气象保障工作圆满成功，甘肃省气象局建设了酒泉卫星发射基地MOS试用客观预报系统和常见灾害性天气短临预报系统。这两个系统的建立主要应用了

①遥感技术  ②全球定位系统③地理信息系统  ④地图

A．①②

B．①③

C．①④

D．②③