How long had the Great Wall existed before Qin Shihuang had it connected？
A. 400 years.
B. 500 years.
C. 1000 years.
D. 2 200 years.
现场救护的“生命链”中的第二环节是______
A. 尽早实施胸外按压
B. 早期高级心肺复苏
C. 早期心脏电除颤
D. 早期高级生命支持
2017广州端午节赛龙舟地点有哪些？广州龙舟赛一览
【C6】
A. Complete
B. All
C. Whole
D. Entire
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