若|a|=4，|b|=2，且|a+b|=a+b，那么a﹣b的值只能是 [ ]
A．2
B．﹣2
C．6
D．2或6
答案：D
The news about the flood surprised all______.
A．the people present
B．the present people
C．the people who present
D．presented people
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