单项选择题
A.conspicuous B.inconspicuous C.a government facility or station D.a radio transmitter
After the passage of a cold front the visibility（）.A.do...
单项选择题After the passage of a cold front the visibility（）.
A.does not change B.improves rapidly C.improves only slightly D.becomes poor
Advise you（）engines．A.stopB.to stopC.stoppingD.stopped
单项选择题Advise you（）engines．
A.stop B.to stop C.stopping D.stopped
Advise（）your fishing gear．A.you recoveryB.you recoverC....
单项选择题Advise（）your fishing gear．
A.you recovery B.you recover C.you recovering D.you recovered
