【单选题】Is this the reason _____ at the meeting for his carelessness in his week? [ ]
【单选题】According to the professor, what is a common reason for migration that does NOT apply to baleen whales?
A.
The need to avoid lower water temperatures
B.
The need to raise young in a suitable environment
C.
The need to find better feeding grounds
D.
The need to find a mating partner
【单选题】1949年1月,获得和平解放的城市是( )。
【简答题】What is the reason for extinction of many fish species?