单项选择题
A light is（）from Changshanzui,the SE extremity of the island.
A.exhibited B.established C.constructed D.built
单项选择题 Integrated Bridge and Navigation Systems(IBS/INS) provide excellent performance and reliable navigation under all conditions by（）.
单项选择题 The lowest point between two waves is called（）.
单项选择题 In summer, monsoon over the South China Sea blows from（）.
