已知|x|=4，|y|=5且x＞y，则2x﹣y的值为[ ]

 A．﹣13

B．+13

C．﹣3或+13

D．+3或﹣13

The teacher made____ her duty to care for the lives and study of her students.

A．one

B．that

C．it

D．this