单项选择题
This is a（）（折叠）type hatch cover.
A.folding B.rolling C.side-rolling D.unfolding
单项选择题 Sailors also keep （）（舷梯）watch.
单项选择题 Don’t （）(系牢) the guy here.
单项选择题 Oil pumped ashore by ships’（）（油泵）.
