所借之权主要指（）。

听力原文：Why does the man get ill?(21)A．He has never been immunized.B．He doesn't rest enough due to hard work.C．He doesn't like to take medicine.D．He is exposed to the virus-filled environment. 点击查看答案

听力原文：Why should the msn go to the university health center?(22)A．He can get free physical examinations there.B．He can get an influenza vaccination there.C．He'll get a prescription for medication there.D．He'll find information on nutrition there. 点击查看答案