14．聽下面一段獨白，回答第17至第20題．
17．When is the worker's busiest time？
A．When they receive baby birds or rabbits．
B．When they care for and raise little animals．
C．When they send animals back into the wild．
18．What is the main reason for the little birds'coming to the wild animal center？
A．Cats or dogs take them away from their nests．
B．People keep them but feed them improperly．
C．They themselves fall out of their nests．
19．Which of the following would be against the law？
A．To take away little animals from their nests．
B．To throw sick animals back into the wild．
C．To take live animals out of their nests．
20．What does the speaker tell people to do at last？
A．To leave little birds on the ground alone．
B．To touch little animals with their hands gently．
C．To trea little birds falling out of nests properly．
