飑线
参考答案：
一种范围较小、生命史较短的气压和风的不连续线。它是由许多雷暴单体排列呈带状的狭窄云带。
China’s hurdler Liu Xiang was disqualified due to false start in the 60-metre event, ______ his rival Dayron Robles of Cuba an easy win of 7.66 seconds.
A．giving
B．given
C．to give
D．gave
边检机关要有效防范危害国家安全人员，违法犯罪分子潜入潜出，切实维护国家主权、安全和社会稳定。
