题干

阅读理解

    One of the most striking findings of a newly research in the UK is that of the people interviewed, one in two believes that it is becoming more difficult to meet someone to start a family with.

    Why are many finding it increasingly difficult to start close relationships? Does modem life really make it harder to fall in love? Or are we making it harder for ourselves? It is certainly the case today that contemporary couples benefit in different ways from relationships. Women no longer rely upon partners for money or status. A man doesn't expect his wife to be in (唯一的) charge of running his household and raising his children.

    But perhaps the knowledge that we can live perfectly well without a partnership means that it takes much more to persuade people to abandon their independence.

    In theory, finding a partner should be much simpler these days. Only a few generations ago, your choice of soul mate was limited by geography, social convention and family tradition. Although it was never clear,many marriages were essentially arranged. Now those barriers have been broken down. You can approach a builder or a brain surgeon in any bar in any city on any given evening. When the world is your oyster ( 牡蛎), you surely have a better chance of finding a pearl.

    But it seems that the old conventions have been replaced by the limitations of choice. The expectations of partners are raised to an unmanageable degree: good looks, impressive salary, kind to grandmother, and right socks. There is no room for error in the first impression.

    We think that a relationship can be perfect. If it isn't, it should be ended. We work to protect ourselves against future heartache and don't put in the hard emotional labor needed to build a strong relationship. Twelve-hour work at the office makes relaxed after-hours dating difficult. The cost of housing and child-raising creates pressure to have a stable income and Career before a life partnership.

上一题 下一题 0.0难度 选择题 更新时间:2018-07-16 02:11:38

答案(点此获取答案解析)

同类题4

植物叶肉细胞光合作用的部分反应、光合产物合成利用代谢途径如图1. 图1中叶绿体内膜上的磷酸转运器转运出1分子三碳糖磷酸的同时转运进1分子Pi(无机磷酸).请回答:

(1)图1中所示①过程为____ 循环,该循环从一个____ 开始,每形成1分子三碳糖磷酸需经过3轮该循环,三碳糖磷酸大部分运至叶绿体外转变成物质a____ ,运输到植物体的各个部分供细胞利用.

(2)磷除了是叶绿体内核酸和酶的组分外,也是光反应为②过程提供____ 的组分.

(3)植物叶肉细胞①反应阶段的示意图,下列叙述正确的是____ .

A.CO2的固定实质上是将电能转化为活跃的化学能

B.CO2可直接被H还原,再经过一系列的变化形成淀粉

C.②发生反应生成三碳糖磷酸属于还原过程

D.光照强度由强变弱时,短时间内a含量会升高

(4)若a合成或输出受阻,下列说法正确的是____ (多选).

A.进入叶绿体的Pi数量减少,导致①反应减弱

B.进入叶绿体的Pi数量减少,导致①反应增强

C.三碳糖磷酸大量积累于叶绿体内外膜的间隙

D.三碳糖磷酸对①反应的调节属于反馈调节

若已知该植物光合作用和呼吸作用的最适温度分别为25℃和30℃,图18为CO2浓度一定,环境温度为25℃时不同光照条件下测得的该植物的光合作用强度.

(5)图2中的A点时,能产生ATP的细胞器有____ ;当光照强度处于图2中B~D时,光合作用有机物的净积累量为____ (S1、S2或S3).

(6)当光照强度处于图18中的D点以后限制光合作用强度继续上升的主要环境因素是____ .

请据图2在答卷图中绘出环境温度为30℃时,光合作用强度随光照强度变化的曲线.(要求在曲线上标明与图中A、B、C三点对应的a、b、c三个点的位置)____