问题 选择题

13C—NMR(核磁共振)、15N—NMR可用于测定蛋白质、核酸等生物大分子的空间结构,库尔特·维特里希等人为此获得2002年诺贝尔化学奖。下面说法正确的是

A.C原子的核内质子数是6

B.N3的核外电子数为7

C.15N的相对原子质量是15 g

D.现代化学研究多采用核磁共振等高级手段,不再需要化学实验

答案

答案:A

不论化学科学多么发达,也不论其研究手段多么先进,化学科学的研究永远离不开化学实验。实际上,利用核磁共振这种先进的技术测定蛋白质、核酸等生物大分子的空间结构,也是利用先进仪器进行的一种化学实验,核磁共振仪只是实验过程中用到的一种仪器而已。另外,C原子的核内质子数是6;N3的核外电子数为7+3=10;15N的相对原子质量是15,不是15g。

阅读理解

Many children would start school hungry without breakfast clubs, teachers have claimed. A new survey suggests these clubs are the only way many students can get a meal before lessons.

About 54% of the 552 school staff questioned by the Association of Teachers and Lecturers(ATL)said their school provides a breakfast club for pupils. The biggest reason for them to attend these clubs is that their parents or carer goes to work early, cited by 76.8% of those questioned.

About 22.6% said children attended due to lack of money at home because parents or carers are unemployed and 15.2% said lack of money at home due to changes or cuts to benefits.

About 17.6% said pupils mainly attend breakfast clubs to socialize.

The survey found that teachers believe that offering breakfast to pupils often helps improve their concentration and ability to learn. One primary school teacher said: “Although there is a charge for our breakfast club, we have accessed funding for those pupils on free school meals and the breakfast club had an effect on their attendance, concentration and being in school for the start of lessons.

ATL general secretary Dr Roper said a nutritious meal at the start of the day has a huge impact on pupils’ ability to learn. “Many schools do everything they can to ensure children eat well during school term-time. But there are many children living in poverty, who we fear won’t be getting a decent meal a day in the holidays and this is something the government needs to address,” she said.

A Department for Education spokesman said: “We know how important it is for children to

have a good breakfast. We want schools and local authorities to use their budgets to best meet the needs of their children. Many provide breakfast clubs which offer a free meal to children from poorer families. The Pupil Premium, which will double to £ 2.5 billion in 2014-2015, targets extra money to help schools to provide support such as this to the most disadvantaged children. The free school meal scheme also ensures that these children have access to a nutritious lunch every day.

小题1:How many factors are mentioned which can account for the popularity of breakfast clubs?

A.Two.

B.Three.

C.Four.

D.Five.小题2:By getting breakfast offered by breakfast clubs, pupils can______.

A.perform better in their study

B.know how they can save money

C.eat better for their lunch and supper

D.make more friends with their classmates小题3:The pupil Premium and the free school meal scheme are mentioned in order to show_____.

A.every child should get access to a nutritious meal

B.breakfast clubs play a key role in children’s growth

C.many efforts are made to provide a good and free meal

D.many schools can’t offer a good and free meal to children小题4:In which part of a magazine can we probably read this passage?

A.Entertainment.

B.Education.

C.Culture.

D.Health.

问答题 简答题