单项选择题
A. 如学生课前没有按要求看书，他们会觉得难以听懂授课内容。 B. 如学生课前不阅读指定书目，他们会觉得难以昕懂授课内容。 C. 如学生课前不看书，他们会很难找到授课内容。 D. 如学生不和同学一起按要求看书，他们很难找到授课内容。
A．the high injury rates for those doing exercises B．the ways to avoid exercise injuries C．the evidences for the seriousness of exercise injuries D．the studies about injury rates and causes for injuries
A．No indication about the recycling of the work. B．Disguising the original work by making small changes. C．Indication about the small changes in the work. D．Substitution of technical terms in two different languages.