单项选择题

A．Because of the bad weather.
B．Because it is fixed up by the headmaster.
C．Because the summer schedule of the class cannot be changed.
D．Because the graduation date cannot be changed.
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Some companies make efforts to keep healthy workers healthy, which will reduce their costs of medical care.
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What do students think of e-textbooks Administrators at Northwest Missouri State University wanted to (26) . Earlier this year, they tested them with 500 students in 20 classes. The university is unusual. It not only provides laptop computers to all 7000 of its (27) students. It does not require students to buy their textbooks, either. They rent them to save money. The school (28) save even more by moving to e-textbooks. The students in the survey reported that (29) the books from the Internet was easy. They liked the idea of carrying (30) backpacks. And 56% said they were better able to find information. But most found that using e-textbooks did not change their study (31) . And 60% felt they read more when they were reading on paper. In all, almost half the students said they still liked physical textbooks better. But the survey found that cost could be a big (32) . 55% said they would choose e-textbooks if using them meant their textbook rental fee would not increase. The administrators are (33) the e-textbooks now available because the (34) are not interactive, for now, most of the books are just words on a (35) . It is believed growth will come when more digital books include video, activities, games and other ways to interact.
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