题目

— I'm very ________ with my own cooking. It looks nice and smells delicious.     —Mm. It does have a _________ smell. A. pleasant; pleased   B. pleased; pleasant   C. pleasant; pleasant    D. pleased; pleased 答案：B 解析: 略在生态系统中，能量最终来源（　　） A、植物B、阳光C、大地D、食草动物