单项选择题

Last Steps on stairs may become a high-risk accident area if they are ()

A.not painted in a different color
B.not marked with bright tapes
C.fixed with grab bars
D.very brightly lit

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说明:假设你是公司职员刘斌,给经理Mr.Johnson写一张请假条。 时间:2008年6月19日,星期四 1.咳嗽特别厉害,想去医院看病; 2.因本周大部分工作已经完成,故星期五请假一天; 3.看完病后,会给经理打电话; 4.对由此造成的不便表示歉意; 5.希望能得到经理的批准。 To.__________ From:__________ Date: _____________ Subject: Leave of Absence
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