- 搜标题
- 搜题干
- 搜选项
单项选择题
21. A.
21. A.
A) They stay with one partner for life. B.
B) They have their own joys and sorrows.
C.
C) They experience true romantic love. D.
D) They help humans in various ways.
A.
选项A
B.
选项B
C.
选项C
D.
选项D
