Pills:

I. Inhibit ovulation and implantation

II. Alter the quality of cervical mucus to prevent or retard the entry of sperms

III. Prevent the ejaculated semen from entering the female vagina

IV. Inhibit spermatogenesis

1. All of the above                              

2. I, II, III

3. I, II                                                

4. I, III, IV

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