History is the story of us, human beings. Everyone who has lived and everything that has h____ are part of history. But history is not only what happened in the past. The word also means the study of the past, through old w____records and other kinds of facts.

    Why do we study history? One r____is that we enjoy it. A good story is even better if it is true, and history is full of good s____though they can be terrible too. A more serious reason is to understand o____and the world we live in. To understand events happening now, we need to know their causes. We cannot understand the p____if we know nothing about the past. History helps us understand why things are the way they are.

    Of course, history books cannot tell us everything about the past, not even everything that i____recorded. A history of the world has to pick out the people and events t____changed the world.

    Since ancient times, great civilizations have appeared in d____countries and regions. Usually, only three or four existed at the same time. While they lasted they changed the l____not only of their own people, but of their neighbors, today.

在图中，画出A所受重力的示意图。根据图中给出的入射光线和折射光线，在方框内画出一个适当类型的透镜。在图中画出滑轮组最省力的绕绳方法。
 

下列各项中划线词语使用正确的一项是（    ）

①2015年，中国电影总票房不孚众望地突破了400亿元人民币大关，国产电影更是创下了票房的历史新高，但“口碑差票房高”现象依然存在。

②中朝有着很深的渊源，本是一丘之貉，理应通力合作，但是朝鲜却不顾中方意见，进行氢弹试验。

③只有与国家和人民休戚与共，把个人荣辱置之度外的人才会得到人民的口碑，得到人民的拥戴。

④***在国务院常务会议上表示，国务院绝不会发空头文件，为官也绝不能尸位素餐。

⑤中国官方正式承认正在建造第二艘航母，但是新航母的性能和美国航母相比只能望其项背，一时难以赶超。

⑥京剧大师梅兰芳先生不仅在舞台上风姿绰约，在日常生活中也气度不凡，无论何时何地，他总能让人为之倾倒。