题目

约100年前，以爱因斯坦为代表的伟大科学家预言，大质量恒星在燃料耗尽、生命终结之后会向内部中心区域崩塌、集聚，最终形成黑洞。2019年4月10日，由事件视界望远镜(EHT )对星系M87中心的观测，获得了人类首张黑洞照片，也验证了爱因斯坦广义相对论在极端条件下仍然成立。这主要说明了①科学实验活动具有社会历史性的特点②实践的根本目的是验证理论的正确性③科学技术促进了人类认识的进步与发展④认识必须经过实践的检验才具有真理性A. BEIJING--No Car Day was first started by 34 cities in France on September 22，1998．It was started to protect the environment．By now，more than 1，000 cities around the world have had a No Car Day． The first No Car Day in China was in Chengdu in 2001．Other cities，including Taipei，Shanghai and Wuhan，also support（支持） the day． In Beijing，more and more people are joining in the activity．It asks drivers to leave their cars at home for one day each month and walk or ride a bike to work．It also calls on Beijingers not to use cars on June 5 （World Environment Day）．The slogan （ 口号）for the day is，"If we drive for one less day，we can have one more nice day．" So far，more than 200，000 drivers have shown their support．"We can't control the weather，but we can choose not to drive，"said Wu Zonghua，a ear club chairman．Beijing is trying to have 238 blue sky days this year．In the first quarter of this year，Beijing only had 52 blue sky days．This was 11 days less than the number for the same period last year．Much of the dust（灰尘） comes from the desert（沙漠） ，but cars cause most of the air pollution（污染）．We must do more for No Car Day． 1．There are _____cities in China that support No Car Day according to the passage． A．three               B．four             C．five               D．six 2．The activity of No Car Day encourages Beijing drivers _______ A．not to work on No Car Day B．to enjoy having a day off C．to leave their cars at home for repair D．to ride a bike or walk instead of driving to work 3．According to the passage there were _____blue sky days in the first quarter of last year in Beijing． A．52                 B．63                C．41                          D．238 4．The air pollution in Beijing is mostly caused by _____ A．cars               B．dust             C．weather          D．rubbish 5．We can know from the passage that _____ A．more and more people in Beijing are joining car clubs B．people will have one more World Environment Day each month C．more and more people won't drive on No Car Day in Beijing D．more people in the world won't drive any more