鲸、海牛的牙列为（）
A.单牙列
B.多牙列
C.端生牙
D.同形牙
E.异形牙
参考答案：A
In that terrible earthquake, who were killed was more than 60,000.
A．a large number people
B．the number of people
C．a number of people
D．many people
Unix下修改文件权限，只有所有者才能修改、执行该文件（）。
A.chmod 700 filename
B.chmod 070 filename
C.chmod 755 filename
D.chmod 022 filename
