题目

取一小块金属钠放在燃烧匙里加热，下列实验现象：①金属先熔化；②在空气中燃烧，放出黄色火花；③燃烧后得白色固体；④燃烧时火焰为黄色；⑤燃烧后生成浅黄色固体物质。描述正确的是（    ） A.①②                     B.①②③                    C.①④⑤                    D.④⑤根据中文及句意写单词。1. Edison ________（发明）about l,000 inventions during his life. 2. Li Zhonghua is one of the greatest ________（飞行员）in China. 3. Yao Ming has played basketball well in the NBA. He is the ________（骄傲）of China.4. Everyone is here. No one is ________（缺席的）. 5. Having too many cooks ________（搞糟）the broth. 6. Everyone can be ________（成功）someday.