债券是一种由债务人向债权人出具的，在约定时间承担还本付息义务的书面凭证。( )
参考答案：对
为解决我国东部地区能源紧张的状况，国家已经采取的措施有
①限制企业和居民用电 ②建设核电站 ③积极开发海上油气资源 ④西气东输 ⑤西电东送 ⑥南水北调[ ]
A．①②③④
B．③④⑤⑥
C．②③④⑤
D．②④⑤⑥
Water makes up some 70 percentage points of the body, and drinking enough water-either tap water or expensive mineral water-will ensure that the body is properly lubricated and flushed.()
A. per-cent
B. per capita
C. percent
D. percentage
