单选题 ______ Pacific Ocean is ______ very large sea to the west of North and South America, and to the east of Asia and Australia.

【正确答案】 A

【答案解析】[解析] 表示海洋、湖泊等地理名词前要加定冠词the；不特指的可数名词单数前要加a或an(首字母发音是元音的单词时)。故选A。