Unit 3Inventors and inventions . 完形填空阅读下面短文，掌握其大意，然后从115各题所给的A、B、C、D四个选项中，选出最佳选项。One student took a box of chicken to class.Another carried on a cellphone _1_ and still another whistled loudly every time the _2_ turned his back.Reform school？No. College.More and more，professors say，they are coming across _3_ students in their classrooms.Many of todays young scholars arrive late，leave _4_，talk loud or take care of personal _5_ such as paying bills during class.Why are t
