①与时俱进，用艰苦奋斗精神磨砺意志，顽强拼搏       ②努力养成勤俭节约的美德，一直过艰苦贫困的生活

③坚持从自己做起、从身边的小事做起、从现在做起   ④自觉接受艰苦环境的锻炼，自觉培养钻研探索精神

A．由四种元素组成               B．相对分子质量为336g

C．其中氮元素的质量分数最小     D．其中氢元素和氮元素的质量比为

1935--1942年美国“工程进展署”修建项目表

如图，△OAB绕点O逆时针旋转80°得到△OCD，若∠A=40°，∠D=110°，则∠α的度数是（   ）

破阵子·为陈同甫赋壮词以寄之

（辛弃疾）

醉里挑灯看剑，梦回吹角连营。八百里分麾下炙，五十弦翻塞外声，沙场秋点兵。

马作的卢飞快，弓如霹雳弦惊。了却君王天下事，赢得生前身后名。可怜白发生!

    Once upon a time, there was a poor fisherman. He always dreamed of becoming 1, and so did his wife.

    One day, while he was sitting on the boat, he 2 felt that the fishing rod was being weighed down by a 3 object.

    He excitedly 4 hard at it and what he saw made him cry. "Wow! A big 5gold chain!" He tried to get the gold chain into the boat, but there seemed to be no 6 to it. His boat started to get over-loaded and the sea water filled his boat. It was really 7. However, he had begun dreaming of a big home, a big piece of land and buying many horses and cows. He kept pulling the chain 8 the boat kept sinking. The boat finally went under the surface of the sea and he tried to swim. 9, his feet were trapped (陷入) in the gold chain and at last he 10 in the sea.

    In fact, there are many people like the fisherman in our life. They always want to get the fortune (财富) 11 hard work. The truth is that desire (欲望) is 12. Only through hard work can we achieve our dreams and live a better life. You may 13 at times and others will think you are crazy at times. But if you 14 that you can succeed, you finally will. Always remember that the bright future can only be created by 15.

三个氢离子；一个二氧化碳分子。

①新的变化意味着新的机会和可能，应该去争取

②这些变化都是发展自我，培养自己综合素质的好机会

③面对变化要勇于迎接挑战

④环境变了，要积极做出自我调整