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Singles' Day ---- the Chinese opposite of Valentine’s Day has turned into a massive online shopping event. It is a day when single people are supposed to buy themselves presents. But there are sociological reasons behind China's “celebration” of single life. And the imbalance could have big consequences for the country. There were 34 million more men than women in China in 2011. Part of that is natural – usually there are 105 boys born for every 100 girls. But the Chinese gender ratio (性别比例) at birth is much more obvious. It was 116 boys to 100 girls in 2012. The one child policy is largely to blame. Brought in to limit population expansion, the policy allows only one child per family. But because male children are seen as more valuable, as well as more likely to support their parents in old age, some parents choose to have a son over a daughter. The result is that large numbers of men will likely never get married. In fact, one study has predicted that by 2030, 1 in 5 Chinese men in their 30s will never have married, while another states that 94% of unmarried people in China are men. Traditionally, China has seen high levels of marriage, usually among the young. Besides, the increased education and career opportunities for women have meant that marriages are happening later. It is also traditional that women often marry men of a higher socioeconomic status than themselves. So women at the top and men at the bottom find themselves alone. One study has even suggested a link between an imbalanced gender ratio and growth in violent crime in the country. Singles’ Day can’t solve all the problems China’s singles face. Indeed, it is possible that it is causing even more problems, as men resort to(诉诸于) increasingly risky lines of work to increase their chances of gaining money and thus a wife. I am worried that as money starts to overcome romance, there is evidence that China’s marriage market is increasingly materialistic.
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参考答案:
举一反三
【单选题】下列关于肽单元的叙述,错误的是:( )
A.
是组成多肽链的二级结构的基本单位
B.
Cα1.C=O、N-H、Cα2六个原子在同一个平面
C.
肽键中的氢和氧总是反式结构
D.
在肽单元中与α-碳相连的单键可以自由旋转
E.
相邻两个肽单元的相互位置与α-碳两侧单键旋转无关
【单选题】听力原文:(A) A man is driving the truck. (B) A man is holding the container. (C) Some containers are in the street. (D) A car is parked on the side of the road.
A.
B.
C.
【单选题】关于肽单元叙述错误的是( )。
A.
组成肽键的 4 个原子 C 、 O 、 N 、 H 和与之相邻的 2 个α碳原子 C α 1 、 C α 2 均位于同一酰胺平面内,构成肽单元
B.
绝大多数肽单元中 C α1 和 C α2 在平面所处的位置为顺式
C.
肽单元中 Cα 分别与 N 和羰基 C 相连的键都是典型的单键,可以自由旋转
D.
Cα 与羰基 C 的键旋转角度以 Ψ 表示
E.
Cα 与 N 的键旋转角以 φ 表示
【单选题】下列关于β-折叠的叙述错误的是
A.
β-折叠是蛋白质的二级结构形式
B.
相邻肽单元平面折叠成锯齿状
C.
侧链大小不影响其形成
D.
局部两个肽段可折叠形成相同或相反走向
E.
其稳定靠氢键维持
【简答题】某企业只生产一种产品,单价200元,单位变动成本160元,固定成本400000元,1998年销售量为10000件。企业按同行业先进的资金利润率预测1999年企业目标利润基数。 已知:资金利润率为20%,预计企业资金占用额为600000元。 要求:(1)测算企业的目标利润基数; (2)测算企业为实现目标利润应该采取那些单项措施。
【简答题】某企业只生产一种产品,产量为2000件,单价为10元。单位变动成本为6元,固定成本总额为40000元。 要求: (1)计算单位边际贡献、边际贡献总额和边际贡献率; (2)计算变动成本率。
【单选题】下列有关肽单元的叙述,错误的是
A.
肽单元上Cα 原子所连的两个单键可以自由旋转
B.
肽键中C-N键所连的四个原子处于同一平面
C.
肽键具有部分双键性质
D.
肽键旋转而形成了β-折叠
E.
肽键中的C-N键长度比N-Cα单键短
【多选题】下列参数中属于舒适光环境影响因素的是()。
A.
阴影
B.
气压
C.
亮度
D.
照度
【单选题】关于肽单元的叙述,错误的是
A.
形成多肽链二级结构的基本单位
B.
形成肽键的六个原子在一个平面内
C.
肽键键长介于单键和双键之间
D.
肽键没有双键性能
【单选题】关于蛋白质二级结构的叙述,错误的是
A.
涉及肽链主链骨架原子的相对空间
B.
涉及肽链中氨基酸残基侧链的原子空间排列
C.
α-螺旋和β-折叠是其主要结构形式
D.
折叠是以肽键平面(肽单元)为结构单位
E.
不具有生物学功能
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