阅读下文，回答相关问题
                                                                                                                      草书大王
       张丞相好草书而不工。当时流辈①皆讥笑之。丞相自若②也。一日得句③，索笔疾书，满纸龙蛇飞动。使侄录之。当波险处④，侄罔然而止。执所书问曰：“此何字也？”丞相熟⑤视久之，亦不自识。诟⑥其侄曰：“汝胡⑦不早问，致余忘之。”
注释：①流辈：人们。②自若：像自己原来的样子，不变常态。③得句，得到佳句。④波险处：书法中笔画怪诞的地方。⑤熟：仔细。⑥诟（gòu）：责骂。⑦胡：为什么。

B

China has a very long history. It has many great traditional skills that have a widely influence(影响). Here we mainly talk about kites.

  The earliest mention of a kite in ancient China dates back to the 5th century BC. It was made of wood and used as a rescue signal(求救信号).

  At the time between 770 and 221 BC, Chinese kites were actually called “muyuan”. They were first invented in Shandong Province for military purposes(军事目的). The kites were used to send important messages during the Chu-Han War(203-202 BC). During the Tang Dynasty(618-907 AD), kites were made of lighter materials, such as bamboo, silk and paper. At that time, people began to fly kites for other purposes. It was believed that letting go of the kite could remove bad luck and illness.

  Today, kite-flying is an interesting and healthy activity in China. There are large kite-flying festivals held throughout the country, and kite makers can show off their skills during the festivals.

小华用50N的水平力推重为400N的物体沿水平面做匀速直线运动物体在5s内移动5m，在此过程中，小华对物体所做的功是____ J，小华对物体做功的功率是____ W，重力做功的功率是____ W。

冬天到了，小明发现大多数人都穿着深颜色衣服．请你根据这一现象提出一个探究问题．