下列属于孔子教育思想的是（　　）

①因材施教 

②知己知彼，百战不殆 

③温故而知新 

④知之为知之，不知为不知

平面上有6条两两不平行的直线，求证：在所有的交角中，至少有一个角小于30.1°．

材料一：

    党的十八届五中全会10月29日在北京胜利闭幕，会议审议通过了《中共中央关于制定国民经济和社会发展第十三个五年规划的建议》。

    全会及其通过的《建议》提出了全面建成小康社会的新目标，首次提出创新、协调、绿色、开放、共享五大发展理念，为中国“十三五”乃至更长时期的发展描绘出新蓝图。

    “‘十三五’规划将是党的十八大把生态文明纳入‘五位一体’总布局后的首个五年规划，公报将‘生态环境质量总体改善’列入全面建成小康社会的新目标，并用很重的篇幅强调坚持绿色发展，释放出党中央努力建设美丽中国的决心和信心。”清华大学经济管理学院教授白重恩说。

（摘编自《新华网》）

材料二：

    8月4日，中央电视台开始在新闻联播节目推出《塞罕坝生态文明建设范例启示录》系列报道。报道称，塞罕坝主动修复生态，践行“绿水青山就是金山银山”理念，是生态文明建设的一个活标本。

    三代人用了55年的时间，将昔日飞鸟不栖、黄沙遮天的荒原，变成百万亩人工林海。塞罕坝林场的有林地面积，由建场前的24万亩增加到目前的112万亩，成为世界上面积最大的一片人工林。森林覆盖率由12%提高到80%。

    今天的塞罕坝，绿水青山带来真金白银，绿色发展之路越走越宽。郁郁葱葱的林海，成为林场生产发展、职工生活改善、周边群众脱贫致富的“绿色银行”。

（摘自《人民日报》）

材料三：

    中新网北京8月8日电（记者张尼）日前，第四批中央环境保护督察前面启动，督察组将分别进驻吉林、浙江、山东等8省份，这也标志着中央环保督察将实现对31省份的全覆盖。此前批次的督察中，已有上万人被问责。新一轮督察风暴又将揪出哪些环保“顽疾”引发外界关注。

    从另—组数字上也能看出中央环保督察取得的成效。环保部副部长黄润秋近曰透露，此前的中央环保督察中，初步罚款约8.8亿元，立案侦查1183件，拘留1103人，约谈13593人，11390人，切实推动解决了一大批环境问题，增强了人民群众获得感。

（摘编自《中国新闻网》）

材料四：

    地球是你我共同的家园，建设美丽家园离不开我们每个人的一起参与、共同行动。我们每—个人都不能只当坐而论道的旁观者，而应成为躬身践行的参与者，从自己做起、从生活中—点一滴做起，像保护眼睛一样保护生态环境，像对待生命一样对待生态环境。或许个人的力量是沧海一粟、微不足道的，但聚沙成塔、积土成山，众人汇聚起来的力量就是磅礴伟力，唯此就能绘出“生产发展、生活富裕、生态良好”“青山绿水、鸟语花香、幽静宜人”的美丽中国图景，给子孙后代留下天蓝、地绿、水净的美好家园。

（摘录自《南方网》）

    After a homeless man offered a college student in England all the money he had so she'd be able to get home safely, the woman is paying it forward—in a massive way.

    The story began in early December. It was about 3 a.m. and Harrison-Bentzen was panic. “I came out after a student night out and realized I didn't have any battery on my phone. I'd lost my friends,” the 22-year-old told BBC Radio 5. She'd also lost her bank card, she discovered, and she had no money.

    Just then, a homeless man, known only as Robbie, approached the young woman and asked her if she needed help. He reached into his pocket and pulled out all the money he had—loose change amounting to about $4.60. He insisted that Harrison-Bentzen take it to pay for a taxi so she'd get home safely.

    Harrison-Bentzen, a student at the University of Central Lancashire in Preston, England, says she refused to take Robbie's money and found another way to get home. But following her encounter（偶然相遇）with the generous man, she says she couldn't get him out of her mind.

    For the next few days, the student searched for Robbie, driving around the streets with her mom and using social media in an attempt to locate the man. In that time, Harrison-Bentzen says she learned more about Robbie and discovered that he actually had a reputation for helping strangers.

    Finally, after four days of driving around Preston, Harrison-Bentzen found Robbie. She was determined to do something to help change Robbie's life.

    So, earlier this month, the student launched a fundraising campaign in Robbie's name. She explained that she would be spending 24 hours on the streets, so as to “understand the difficulties” that the homeless face on a daily basis.

    Harrison-Bentzen says she had initially（最初）hoped to raise about $780 with her campaign. Her expectations, however, were quickly blown out of the water. As of Thursday morning, 4,800 people have donated almost $50,000.