Reportedly, yesterday a group of American soldiers were walking along the road in Iraq when a bomb was _______, three of whom were killed.

A．set off

B．set out

C．set up

D．set about

测者经度等于150°E，地方平时等于1200，则经度等于60°E的地方平时为（）。

A．1200

B．1000

C．0600

D．0800