课内阅读。

      当人类的胚胎成长到5周左右时，手就出现了，但非常小，如同鱼鳍一般。在随后的发育中，手指慢慢开始成长，手指之间的蹼渐渐退化。到了11周的时候，手的关节、肌肉甚至指甲都已经发育完全。所有的功能已经齐备。一个20周大的宝宝，在母亲的肚子里，已经会用幼嫩的手指给自己的耳朵挠痒了。

       在400万年的进化史中，人类的手逐渐演变成了大自然所能创造出的最完美的工具。这一器官是力量与智慧的象征，是一个精美的机械结构。每只手有29块骨头，一些六指人还会多几块。这些骨头由123条韧带联系在一起，由35条强劲的肌肉来牵引，而控制这些肌肉的是48条神经。整个手掌结构由30多条动脉以及数量众多的小血管来滋养。

    A group of frogs were traveling1 the forests, but suddenly two of them fell into a hole. The other frogs tried to help them. When they saw how deep the hole was, they cried to the two frogs that they could not be saved. The two frogs didn't2 and tried their best to jump up out of the hole. The other frogs 3saying that they were sure to die. 4, one of the two frogs, who heard what the other frogs were saying, gave up. Then he fell down and died.
    The 5 frog, however, continued to jump as 6as he could, and at last made it out. When he 7 , the other frogs asked, "Didn't you hear us?" The frog, who had a poor 8, said, "I thought you were encouraging me all the time."
    The story teaches us a 9:There is power(力量) of life and death in the tongue. An encouraging 10 to those who are down can help them out while a discouraging word can kill them.

有两个共点力，一个力的大小是3N，另一个力的大小是6N，它们合力的大小可能是（   ）

【告慰亡灵，勿忘国耻】

2014年12月13日上午10时，国家公祭仪式在侵华日军南京大屠杀遇难同胞纪念馆举行。中共中央***、***、中央军委主席***出席仪式并发表重要讲话。

“今天的中国，已经成为一个拥有保卫人民和平生活坚强能力的伟大国家，中华民族任人宰割、饱受欺凌的时代已经一去不复返了，中国人民正在意气风发地沿着中国特色社会主义道路，为实现‘两个一百年’奋斗目标、实现中华民族伟大复兴的中国梦而奋斗。”

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