十字路口红绿灯设置的时间长短中包含着许多科学道理。

材料一：中国文武制度，事事远出西人之上，独火器万不能及。……中国欲自强，则莫如学习外国的利器，欲学习外国的利器，则莫如觅制器之器，师其法，而不必尽用其人。

——《江苏巡抚***衙门原函》

材料二：1911年10月10日，革命党人在武昌起义成功，成立湖北军政府，随后南方各省纷纷响应，宣布独立，清政府在全国的统治土崩瓦解。

——人教版历史教材节选

材料三：我们现在认定，只有“德先生”和“赛先生”可以救治中国政治上、道德上、学术上、思想上一切黑暗。

——陈独秀

“确保贫困人口到2020年如期脱贫！”******已向全党全社会发出了扶贫攻坚决战决胜的总号召。

材料一：《S省文化惠民扶贫专项方案》于2015年10月起正式实施。依据精准扶贫的要求和S省文化发展实际，《方案》中明确，到2017年，完成贫困地区文化基础设施建设任务60%以上，公共文化服务供给能力明显增强，各类文体活动广泛开展，人民群众精神文化生活面貌极大改善，文化惠民扶贫集中攻坚取得关键突破。《方案》同时明确将加强农村传统建筑的保护和维修，指导其发展特色文化旅游、现代观光农业等产业，打造藏羌彝地方特色文化品牌，以此带动贫困地区转变经济发展方式。

材料二：某县作为C市14个国家级重点贫困县之一，确立了“2017年贫困村销号、贫困人口越线”的目标。为确保扶贫攻坚任务的完成，该县充分考虑各乡镇实际情况，量身定做脱贫方案。

当地TJ集团是中国医药工业10强，资产200亿元。以TJ集团为依托,该县成立了大歇中药材专业合作社 ，积极推行“公司+合作社+农户”的模式，把种植药材作为了脱贫的主打产业。目前他们已发展中药材1万余亩,形成了产、加、销一条龙发展的路子。该县有10个贫困村、1200户贫困户，其中70%的村民都种中药材,有的贫困户还在中药材加工厂务工。2015年这1200个贫困户户均种植中药材2亩,户均增收达到8000元。

①有理数的绝对值一定是正数；

②互为相反数的两个数，必然一个是正数，一个是负数；

③若|a|=|b|，则a与b互为相反数；

④绝对值等于本身的数是0；

⑤任何一个数都有它的相反数．

其中正确的个数有（   ）

Chopsticks

    ⒈When chopsticks were invented?

    In fact, before the invention of chopsticks, Chinese ancestors actually used hands to eat, but how did they eat soup（汤菜）and porridge? ____ Chinese started to use chopsticks about 3,000 years ago in Shang Dynasty.

    ⒉Who invented chopsticks?

    The records of using chopsticks have been found in many written books but lack physical evidence. However many stories are about the invention of chopsticks. One says that Jiang Ziya, an ancient wise man, created chopsticks. ____ But there is no exact history record about the invention. We can only say that smart ancient Chinese invented chopsticks.

    ⒊How to use Chinese chopsticks.

    Using two slim sticks to pick up food is actually not difficult. You can do it if you practice it for some time, even if you are a foreigner. The key to managing chopsticks is keeping one chopstick in position while moving the other to pick up food. ____

    ⒋Chopsticks Manners

    Chopsticks are usually held in the right hand, and left-handed chopstick use is considered as improper in China. Playing with chopsticks is thought to be impolite. ____

    ⒌The philosophy of Chinese chopsticks

    Chinese philosopher Confucius advised people to use chopsticks instead of knives because the metal knives remind people of cold weapons, which mean killing and violence.

    ⒍A chopsticks-themed museum can be found in Shanghai

    If you are truly interested in chopsticks, you can pay a visit to the Shanghai Chopsticks Museum. The museum gathered more than 1,200 pairs of chopsticks from China, Korea, Japan and Thailand.____

A. Chopsticks were introduced to many other neighbor countries due to its lightness and convenience.

B. It is considered to be polite and thoughtful to pick up food for the elderly and children.

C. Bamboo chopsticks are most frequently used in Chinese daily life.

D. The oldest one was from the Tang Dynasty.

E. There also go around some other stories.

F. Remember to practice with patience.

G. They had to use sticks to eat them.