党的十八大镌刻着党对13亿人的幸福承诺，健康是促进人的全面发展的必然要求。要坚持为人民健康服务的方向，坚持预防为主、以农村为重点、中西医并重，按照保基本、强基层、建机制要求，重点推进医疗保障、医疗服务、公共卫生、药品供应、监管体制综合改革，完善国民健康政策，提供安全有效、方便价廉的公共卫生和基本医疗服务。

结合材料运用***的有关知识分析党的十八大为什么要对13亿人的幸福作出承诺。

    A meteorite（陨石）almost____(hit) an 80-year-old man named Arthur Pettifer in the UK while he____(work) on the farm. The meteorite was____(big) in the past 26 years in the UK. It weighed（重）one kilo, and might be over 4,000,000,000years old.

    "I heard the big noise in the air. I looked up and saw something falling from the sky to the ground（地面）____ (heavy)," he said, "I had a bad____(feel) about it at that time.____ first I thought it was a plane."

    Meteorites are small things from the space.____ about 3,500 meteorites may fall on the earth every year, only very few of these____(fall) rocks are found. Mr. Pettifer's meteorite is the fifth to fall in the UK____the year of 1939.

    Mr. Pettifer is glad. "When you think about it coming from so far away.____ really is something strange."

火柴可以擦燃，也可以用火点燃，前者是用____ 的方式使火柴燃烧，后者是用____ 的方法使火柴燃烧，两种方法都可以改变物体的内能．