1、单选题：
The time between fertilization and birth is called ___________.
选项：
A:perinatal period
B:prenatal period
C:germinal period
D:fetal period
答案: 【prenatal period】

2、单选题：
What’s the function of mucus?
选项：
A:To block the entrance of the sperm to the woman’s womb for all time
B:To enable the sperm to burrow into the corona radiata
C:To attack the sperm from all directions
D:Transformed by hormones to from a barrier into a chemical rope ladder for sperm to enter the cervix
答案: 【Transformed by hormones to from a barrier into a chemical rope ladder for sperm to enter the cervix】

3、单选题：
Where does the union of a human egg and sperm usually occur in?
选项：
A:the ampulla of the fallopian tube
B:cervix
C:vagina
D:ovary
答案: 【the ampulla of the fallopian tube】

4、单选题：
The head of the sperm contains______________.
选项：
A:the nuclei and the acrosome
B:the nucleus and the flagellum
C:the nucleus and the acrosome
D:the nuclei and the flagellum
答案: 【the nucleus and the acrosome】

5、单选题：
The organelles, which are responsible for giving energy to propel the sperm towards the egg are called______?
选项：
A:flagellums
B:gametes
C:torpedoes
D:mitochondria
答案: 【mitochondria】