短文填词。（本大题共10小题，每小题1分，满分10分）

Students learn their lessons in class. They sit in the classroom and l 1  to the teacher. This is a way of learning. Is this the o 2  way for students to learn? Of course not. There is another way to learn. That is students can teach themselves. For e 3  , if you cannot remember something when you are doing your homework, what will you do? You can look at your books to f  4   the answers.

How to teach yourself? The first thing you must do is reading. Read something you are i 5  in, or you have to read. The second is that you must ask yourself questions. A clever student is usually g 6  at asking questions. The third is to answer the questions yourself by w 7  hard, by reading books, and sometimes by asking o 8  people. These are the ways of teaching yourself. If you keep doing l  9 these for a long time, You are sure to have great s  10  in your study.

药物的有效期是指

A．药物溶解100A，所需的时间

B．药物降解10%所需的时间

C．药物溶出10%所需的时间

D．药物释放10%所需的时间

E．药物吸收100%所需的时间