单项选择题
This actually makes it harder to dress appropriately, but fortunately most offices also（）a few signals.
A.send for B.send off C.send up D.send out
单项选择题 Every office has a dress code,but in today’s（）workplace，they aren’t always written.
单项选择题 Structural traps are traps（）are formed because of a deformation in the rock layer （）contains the hydrocarbons.
单项选择题 he oil（）in a source bed, and a marine shale.
