C．how many times a marathon runner can set the world record

　　D．if she has the ability to produce four or five world­class times

　　解析　推理判断题。由上文提到的world record time可知，数目指的是次数。

　　答案　C

　　C

　　Heading off to college this year？Here are some fashion tips from our experts you should keep in mind：

　　Dress to impress：Stylist and business consultant Daniela Smith says，“Girls should keep in mind that your college professors will often be the bridge that connects you to your future career and your classmates will become your professional network.You don't need to dress like you're going to the office，but you should display an ability to properly present yourself with appropriate maturity and confidence，and look put­together.”

　　Logo mania(品牌狂热症)：Wearing the logos of brands aimed at younger customers physically identifies you as part of that age group，so consider the targeted age group of the stores you shop at.It's tempting to load up on logos，especially well­known logos that signify high­end brands.But consider this：college is a time of self­discovery，a chance to develop your own personal style.Instead of wearing logos head to toe，“walking advertisement”­style，why not express who you really are?

　　Wear real pants：The combination of leggings and baggy shirts is all too common on college campuses.Smith points out that leggings，yoga pants，and sweatpants are entirely unacceptable in public unless you're exercising.Although leggings worn as pants are a common trend among high school and college girls，they are not an appropriate choice for daywear.As a young woman，your style choice should begin to reflect your maturity level.So，get rid of leggings and wear real pants!

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