比赛时模型飞机在飞行中无论何时越过场地的安全线就是对参加活动的人群构成了安全威胁，因此必须指令遥控模型飞行员立即降落模型飞机。
参考答案：对
29._____ that they had to stay at home all day.
A．So the weather was terrible
B．The weather so terrible was
C．So terrible was the weather
D．So was the terrible weather
根据《UCP500》，信用证金额、单价、数量前如有“about”、“circa”或类似意义字样者，所容许的差额不超过( )。
A．5％
B．8％
C．3％
D．10％
