19.Questions 19 to 21 are based on the passage you have...
单项选择题 19.Questions 19 to 21 are based on the passage you have just heard. A.
A) Why dogs can be faithful friends of humans.
B.
B) The nature of relationships between dogs.
C.
C) The reason a great many people love dogs.
D.
D) How dogs feel about their bonds with humans.
