短效口服避孕药应按时按量服用，服药不能中断，必须连续服（）。
A、10天
B、16天
C、22天
D、24天
参考答案：C
质剂
Choose the correct letters A-C.
How do offenders avoid detection A. They take a lot from many people. B. They take a little from one person. C. They take a little from many people.
