oceans of 与an ocean of 的区别?

oceans of 与an ocean of 的区别? an ocean of 怎么用? Look,____people are walking in the street.英语选择题（ ）Look,____people are walking in the street.A.a lotB.an oceanC.an ocean ofD.ocean of选哪个?我觉得没有正确答案.应该写的是oceans of.各位英语高手帮忙看一看. a drop of an ocean 词组翻译 An Ocean of Air的作者是? in an ocean of paper 的意思 an army of/ an ocean of +可数还是不可数? Ocean cover about three-quarters of the earth's surface.（对'three-quarters 提问）____ ____ of the earth's surface ____ oceans ____. 首字母：Whales live in the o_______.ocean还是oceans 英语翻译词组：swim in an ocean of paper an ocean of 后跟可数名词复数还是单数 an ocean of修饰可数还是不可数名词? Ocean Park is a theme park,______ purpose is to teach visitors about the oceans.A.whose the B.one whose C.its D.of which the Atlantic Ocean is one of the oceans that separate the Old World from the接上题new.解释下句子结构,怎么自己翻译不过来呢. ocean是可数名词吗the blue parts on the earth are (oceans 还是ocean). A sea is usually part of the ocean A sea is usually part of an ocean 那个对? Ocean fishing accounts for 80% of the world fish catch.The other 20% comes from inland fishing (5%) and other source (15%).95% of all ocean catches occurs in coastal waters.1/4 to 1/3 of the world’s ocean fish catch is used to feed animals.Oceans h the cried of ocean