题干

判断对错.

7是14和42的最大公因数

上一题 下一题 0.0难度 选择题 更新时间:2016-11-29 11:29:17

答案(点此获取答案解析)

同类题1

阅读以下材料:
材料一 1851年,英国维多利亚女王发出外交邀请信函,有10个国家应邀参加伦敦博览会,这被确认为现代意义上的首届世博会。直到今天,世博会已经成为全球规模的盛会。 
                                                                                                                                   ——引自中广网《回顾1851年英国伦敦首届世博会》
材料二 第二次工业革命时期,由于自然科学的新发展,并开始同工业生产紧密结合起来,使第二次工业革命取得了巨大的成果;第二次工业革命几乎同时发生在几个先进的资本主义国家,新的技术和发明已超出一国的范围,其规模更加广泛……
材料三 工业革命以来一些工业发展的城市和工矿区人口密集、物流量大,煤的燃烧量急剧增加,大气污染的环境问题不断发生。如1873、1880、1882、1891、1892年,英国伦敦多次发生可怕的有毒烟雾事件……近乎残酷的空气治理法案随之而来,让伦敦走上了铁腕治污的救赎之路。
请回答:
(1)结合所学知识,从政治和经济两个方面分析,英国为何能首先举办世博会?
(2)根据材料二,归纳第二次工业革命的特点
(3)根据材料三,说明在社会生产发展的同时出现了什么问题?
(4)综合上述材料,谈谈你的认识。

同类题5

阅读理解

    Norman Borlaug, who is making a difference, is known around the world. He is often described as the man who has saved more lives than any other person in history. Norman Borlaug is considered the father of what has been called the Green Revolution. His ideas about agriculture increased crop production and ended hunger in many nations. Mr. Borlaug continues to be a leader among agricultural researchers.

    Norman Borlaug was born in 1914 on a farm in the American state of Iowa. In the middle of the 20th century, world population was expanding faster than food production. Experts said many people in developing countries would face starvation.

    Norman Borlaug was an agricultural researcher at the International Maize and Wheat Improvement Center in Mexico. He developed methods of growing wheat that increased the amount harvested by three times. He later repeated this success in India, Pakistan and Africa.

    His methods of farming saved millions of people who would have starved to death. Norman Borlaug was given the Nobel Peace Prize for his efforts in 1970.

    Norman Borlaug is still urging experts to think about the needs of people around the world. His latest concern is a disease in wheat called UG99. He says it has the power to destroy most of the wheat being grown around the world. He says reductions in agricultural programs have made it harder to take action against such threats.

    Mr. Borlaug's granddaughter Julie works at the center named after him at Texas A&M University in Dallas. She says his worry about food problems rises from the belief that hunger is unacceptable. She says Norman Borlaug still believes it is our responsibility as human beings to feed one another.