下图是A、B两种不含结晶水的固体物质的溶解度曲线．下列说法中错_爱下问搜题

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问题选择题

下图是A、B两种不含结晶水的固体物质的溶解度曲线．下列说法中错误的是（　　）

A．t₁℃时A、B的溶解度相等

B．B的溶解度都随温度升高而增大

C．将t₂℃时A的饱和溶液降温到t₁℃时，溶液变稀了

D．将t₂℃时A、B的饱和溶液降温到t₁℃，A溶液会析出晶体而B不会

答案

A、t₁℃时，两物质溶解度曲线交于一点，说明此时两物质的溶解度相等．说法正确；

B、B物质的溶解度曲线随温度升高而上升，说明B物质的溶解度随温度升高而增大．说法正确；

C、由于A物质的溶解度随温度降低而减小，因此将t₂℃时A的饱和溶液降温到t₁℃时，由于溶解度减小溶液的溶质质量分数减小．说法正确；

D、A、B两物质的溶解度都随温度降低而减小，因此将t₂℃时A、B的饱和溶液降温到t₁℃，两物质都会析出晶体．故说法不正确；

故选D

完形填空

It was a cold, wet day on June 6th, 2007, when 14-year-old Wasana arrived at school. Waiting outside his classroom for his classmates to         ,Wasana stared at the         ,then his eyes fell upon the 18-metre-high hill that         at the back of the classroom.
He         large amounts of rainwater flowing down the hill, and water was also bubbling at the base of a rock on the hill. For a few minutes, Wasana         the water, wondering why it looked so        . Then it hit him—the         was similar to the video he was shown during Disaster Management classes. Fearing a         disaster, he shouted         at the students waiting outside their classrooms. “Run, run, don’t stay here! The         on the hill is going to fall on us! ”
Chaos broke out as the         ran to the open area that had been appointed as an emergency gathering point. When some teachers         Wasana, he showed them the water gushing from the hill, and they started leading the students to safer ground.
Just then Principal Gurusinghe drove into the school. Wasana ran over to tell him what was happening. After         the site, Grrusinghe knew the school was in      The enormous rock at the top of the hill could come crashing down        .
       a group of teachers and older students Gurusinghe climbed the hill and tried to make the water flow away from the rock. They were too        : ten minutes later, they heard screams as the huge rock rushed down the hill. There was little Grrusinghe and his group could do as they watched the earth         their classrooms. Thanks to Wasana’s         action and careful observation,        was hurt in the accident.

C．interesting

A．at any minute

B．for the moment

D．at one time

单项选择题

阅读以下文字，完成下列问题。

“蚁族”这一新生名词迅速成为社会上流行的语词，因为它隐喻了社会的变革发展中正在形成的重要问题，即教育在个人的社会地位获得过程中所具有的效用与价值的问题。
在现代社会中，平等开放与普适化的教育是社会个体成员获取社会地位与资源，获得向上的社会流动的基本途径。青年学生通过接受教育，积累知识、技能、经验与才干等人力资本，使自己在职业变换、居住迁移、身份地位的改变等社会流动的过程中具有较强的竞争力。由此而形成的社会将是一个更为开放的平等社会。然而现如今“蚁族”的出现和蔓延，或明或暗地表述了另一种事实与逻辑，它反映了在当今社会流动与地位获得的过程中，教育所铺架的向上流动的梯桥出现了明显的短路和断线。
在现代社会中，相对于金钱财富、权势身份以及关系网络，教育更有助于开放平等的社会流动与地位获得，也是社会中间阶层得以形成壮大的重要条件，但是教育的这些效用的实现是有条件的。相比而言，钱财、权势和关系的向上流动效用，依赖于社会中人们相互之间的需求与交换，靠的是在这样的需求与交换基础上所形成的市场，[①]存在着交换的可能，形成了这样的市场，它们[②]可以推动向上的流动与地位资源的获得，[③]这样的一个市场缺少合理的规则和公正的秩序。
但教育效用的实现则不仅需要有体现教育价值和人力资本的市场，更需要有维护和保障市场公正的规则与机制。这规则与机制包括公正开放的市场竞争规则、公平合理的收入分配机制以及完善健全的福利保障制度。缺少了这些，教育所累积的人力资本，将难以实现其应有的竞争能力，教育所产生的收入回报也将难以得到稳定的增加和提高，最终教育的向上流动和地位获得的功能效用将难免大打折扣。那么，在不断的社会流动与阶层重构的过程中，教育所拥有的促进社会平等、培育社会中间阶层和建构社会理想与价值的功效和作用无疑将黯然失色，以知识技能见长的新兴阶层也终将难以成为支撑起社会中间阶层的稳定和坚实的社会力量。对此需要保持足够的警惕与清醒的认识，在改进教育体制和促进经济发展的同时，切实地完善和健全相关各方面的市场与社会的规则和机制。

“蚁族”一词所用修辞方法与下面哪个词语相同( )

A．白领
B．蜗居
C．宅男
D．房奴