地市级内训师每年应至少承担（）的授课任务。
A.8学时
B.10学时
C.15学时
D.18学时
参考答案：D
From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
A．when
B．until
C．since
D．before
Mobile Market和移动梦网的区别是什么？
