单项选择题
All the rubber bales were separated（）.
A.by grade B.by a grade C.by the grade D.by the grades
单项选择题 All the torn bags are treated（）original ones.
单项选择题 All these containers will be loaded（）deck.
单项选择题 As these features are not all charted, special caution should be exercised（）vessels navigating in the vicinity.
