阅读下列四篇短文，从每小题后所给的A、B、C、D四个选项中，选出最佳选项。

　　Andy Steele lives just a few blocks from the campus of Black Hills State University in Spearfish, S．D．, so commuting(经常往返)to class isn't the problem．But he doesn't like lectures much, isn't a morning person, and wants time during the day to restore motorcycles．

　　So Steele, a full-time senior business major, has been taking as many classes as he can from the South Dakota State system's online offerings．He gets better grades and learns more, he says, and insists he isn't missing out on the college experience．

　　“I still know a lot of people from my first two years living on campus, and I still meet a lot of people, ” he says．But now, he sets his own schedule．

　　At least 2.3 million people took some kind of online courses, according to a recent survey by The Sloan Consortium, an online education group, and two-thirds of colleges offering “face-to-face” courses also offer online ones．But what were once two different types of classes are looking more and more alike and often falling into the same pool of students．

　　At some schools, online courses originally intended for non-traditional students living far from campus have proved surprisingly popular with on-campus students．A recent study found 42 percent of the students enrolled(登记)in its distance education courses were located on campus at the university that was hosting the online courses．

　　Numbers vary depending on the policies of particular colleges, but other schools also have students mixing and matching online and “face-to-face” credits．Motives range from lifestyle to adapting a job schedule to getting into high-demand courses．

　　Washington State had about 325 on-campus undergraduates taking one or more distance courses last year．As many as 9, 000 students took both distance and in-person classes at Arizona State last year．

　　“Business is really about providing choices to their customers, and that's really what we want to do, ” said Sheila Aaker, extended services coordinator(协调人)at Black Hills State．

　　Many schools, such as Washington State and Arizona State, let departments and academic units decide who can take an online course．They say students with legitimate academic needs-a conflict with another class, a course they need to graduate that is full-often get permission, though they still must take some key classes in person．

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　　I was having a bad week．Christmas was over and the weather was very cold．　　1　　 was piling up．Every teacher seemed to 　　2　　 lots of homework．I walked home in the 18-degree cold, 　　3　　 overwhelmed(压得喘不过气来)and a little sorry for myself．And then I 　　4　　 him, a man obviously 　　5　　, pushing a shopping cart he no doubt“　　6　　”from a local supermarket．It probably held most of his earthly possessions, which 　　7　　 a disheveled sleeping bag and a few bottles to be returned for a nickel(5分钱)　　8　　．He stood miserably, clapping his hands and stomping his feet, 　　9　　 this action would replace central heating．

　　And then I 　　10　　 how close I was to home and 　　11　　, eventually, I would be warm and safe．It made me 　　12　　 about how lucky I was that my primary focus was not warmth or 　　13　　, but academics．　　14　　 so I thought, I have a lot to be thankful for．

　　I began an alphabetic list of the things I should be thankful for, like April vacation, apple pie, and 　　15　　．My spirits 　　16　　 as I remembered barbecues, babies and birthdays．How glad I was 　　17　　 had caring teachers, and chicken wings．As I slid my key into the door, I realized that I had only 　　18　　 the letter C．I felt warm and grateful．I told myself 　　19　　 the next overwhelming day, I would remember to begin 　　20　　 the letter D．

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