问题 判断题

开发商获得土地使用权以前即可进行招标。

答案

参考答案:

解析:开发商只有获得招标批准后才可进行招标。

问答题

在师生联谊晚会上,化学老师表演了“吹气生火”的魔术.用棉花将一种淡黄色的固体包裹其中,将一根长玻璃管插入棉花团中吹气,稍后棉花团剧烈燃烧起来.同学们为了揭开这个魔术的秘密,进行了如下探究.

【相关信息】:①淡黄色固体成分是过氧化钠(Na2O2).

②吹出的气体主要成分有氮气、二氧化碳和水蒸气.

③过氧化钠与氮气不反应.

④碳酸钠溶液呈碱性.

【分析讨论】:根据棉花团剧烈燃烧的现象分析,反应中除了生成氧气外,还说明过氧化钠发生的反应是______(填“吸热”或“放热”)反应.

【提出猜想】:同学们发现残留固体呈白色,对该固体成分进行猜想:

猜想Ⅰ:固体成分是Na2CO3,CO2参加反应.

猜想Ⅱ:固体成分是NaOH,H2O参加反应.

猜想Ⅲ:固体成分是______,CO2和H2O均参加反应.

【实验探究】:同学们在老师带领下用足量且潮湿的CO2气体通入过氧化钠粉末中,充分反应后,取白色固体于试管中配成溶液,设计实验对猜想进行验证.

验证Ⅰ:向溶液中滴加稀盐酸,发现有气泡产生.有同学认为固体成分仅含有Na2CO3

验证Ⅱ:蘸取少量溶液滴到pH试纸上,与标准比色卡比较,pH大于7,有同学认为固体是NaOH.请问此结论是否正确?______(填“正确”或“错误”),原因是:______.

验证Ⅲ:先向溶液中加入足量的______溶液,看到白色沉淀产生,写出反应方程式______;然后向上层清液中加入______溶液,看到溶液呈红色,验证了猜想Ⅲ是正确的.

【实验反思】:由验证Ⅲ的结果可知,验证Ⅰ的结论错误,因为它不能排除______的存在.

【拓展延伸】:根据探究所获得的知识,有同学认为可以用过氧化钠做“滴水生火”的魔术,从燃烧的要素考虑,你认为要使魔术成功必须控制______的用量.

阅读理解

Chinese media and Internet users on Monday condemned a lack of morals in society after a toddler was struck twice by two different vans and left bleeding on the road as more than a dozen bystanders did nothing to help the seriously injured girl.

The incident, captured by a surveillance camera and aired by Southern Television Guangdong (TVS), showed the two-year-old girl was knocked down and run over by a white van on a narrow market street on the afternoon of Oct. 13, in Foshan City of Guangdong Province.

The driver fled the scene of the accident, leaving the girl to bleed on the sidewalk. Over the next six minutes, more than a dozen people walked by the girl, yet not one individual did anything to help her. The girl was then hit a second time by another van before an elderly trash collector came to her aid and brought the attention of the girl’s mother, according to the video and eyewitnesses.

Doctors said that the girl, who was put on life support after being hospitalized, remains in a deep coma. The girl's parents, who are migrants living in the city, are now with her.

Police said the drivers of both vehicles have been arrested. However, the apathy of the bystanders shown in the video has shocked the public, as Internet forums have seethed with anger, and people are questioning the morality of society.

High moral standards were once triumphed as national pride in China where individuals known for selflessly helping others were adored by the public.

But in recent years, the perception of a decline of morals has become a hot topic as profit and materialism are perceived to be affecting society’s values.

On Sept. 2. an 88-year-old man in central China collapsed, his face striking the pavement. Yet, no one came to his aid, and he ended up choking to death on the blood from his nose.

Some have linked the absence of good models to a previous case in which a man trying to help an elderly woman who fell was accused of harming her.

A strong chorus of opinion on the Internet says laws should exempt(免除)models from responsibility, yet laws themselves cannot solve society’s morality dilemma.

Cao Lin, a China Youth Daily commentator, said in a signed article published on Monday that the worry of responsibility should not be an excuse for not helping, and this case exposes the decline of humanity in Chinese society.

小题1:From the passage, what would happen if someone helped others selflessly in the past?

A.He/she would be condemned by the public.

B.He/she would be awarded by the government.

C.The public would feel proud of him/ her and showed love and respect for him/ her

D.He/she would have to worry about liability.小题2:Which of the following is TRUE about this passage?

A.Nobody helped the girl who was struck twice by two different vans.

B.The toddler died immediately after she was hit a second time.

C.High moral standards were once regarded as national pride in China.

D.Journalists from TVS captured the incident by using a camera.小题3:In recent years, society’s values is believed to be affected by           .

A.people’s perceptions

B.profit and materialism

C.the apathy of bystanders

D.the morals of society小题4:According to Cao Lin, what is the fundamental reason for not helping the girl?

A.The worry of responsibility.

B.Lack of laws that exempt role models from responsibility.

C.The decline of humanity in society.

D.The other two cases mentioned in the article--the case of an 88-year-old man and the case where a man trying to help an elderly woman who fell was accused of harming her.小题5:Where is the article probably taken from?

A.A fashion magazine.

B.A news report.

C.A science fiction.

D.An education column.