题干

读下图思考,在其他条件不变的情况下,要使社会总需求曲线从AD向AD’移动,政府必须(   )


①完善社会保障制度,提高社会保障水平

②完善就业服务体系,采取多种措施扩大就业

③提高银行存贷款利息率

④合理制定商品价格,维护市场交易秩序

A:①②

B:①③

C:①④

D:②④

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答案(点此获取答案解析)

B

同类题1

阅读理解

The Diet Zone: A Dangerous Place

    Diet Coke ,diet Pepsi, diet pills, no-fat diet, vegetable diet…We are surrounded by the word “diet” everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically.

    Diet products significantly weaken us psychologically. On one level, we are not allowing our brain to admit that our weight problems lie not in actually losing the weight, but in controlling the consumption of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the scale instead. All we have to do is to swallow or recognize the word “diet” in food labels.

    On another level, diet products have greater psychological effects. Every time we have a zero-calorie drink,we are telling ourselves without our awareness that we don't have to work to get results. Diet products make people believe that gain comes without pain, and that life can be without resistance and struggle.

    The danger of diet products lees not only in the psychological effects they have on us, but also in the physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them instead of healthy foods means we are preventing our bodies from having basic nutrients. Diet foods and diet pills contain zero calorie only because the diet industry has created chemicals to produce these wonder products. Diet products my not be nutritional,and the chemicals that go into diet products are potentially dangerous.

    Now that we are aware of the effects that diet products have on us, it is time to seriously think about buying them. Losing weight lies in the power of minds, not in the power of chemicals. Once we realize this, we will be much better able to resist diet products, and therefore prevent the psychological harm that comes from using them.

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同类题5

三羟基异黄酮(简称GST)是从豆科植物根部分离得到的一种天然产物.它具有显著的抗癌、抑菌、抗氧化等作用.经研究发现:GST可通过影响细胞凋亡基因(Bcl﹣2基因和Bax基因)的表达而诱导癌细胞凋亡.科研人员为研究GST对鼻咽癌细胞的影响和作用机制,进行了以下实验.请完善实验并分析回答相关问题.

实验步骤:

(1)取5个相同的培养瓶,编号A、B、C、D、E,分别加入等量的培养液.向A瓶接种正常细胞,B、C、D、E瓶接种____ .

(2)向C、D、E瓶中分别加入____ 、____ 、____ μmol/L GST溶液.其他培养条件相同且适宜.

(3)培养一段时间后,检测并统计____ ,结果记录于表1.

(4)重复上述步骤,检测、统计,____ 结果记录于表2.

表1

Bcl﹣2基因表达率

Bax基因表达率

正常细胞

不表达

全部表达

鼻咽癌细胞

90%

19%

5μmol/L GST干预组

75%

58%

10μmol/L GST干预组

49%

67%

15 μmol/L GST干预组

22%

85%


表2

鼻咽癌细胞凋亡率

5μmol/L GST干预组

15.72%

10μmol/L GST干预组

27.33%

15 μmol/L GST干预组

35.48%

分析与讨论

①表1数据说明:从基因水平上看,GST诱导鼻咽癌细胞凋亡与Bcl﹣2基因和Bax基因的表达有关.当Bcl﹣2蛋白/Bax蛋白的比值出现____ 趋势时,会诱导鼻咽癌细胞凋亡.

②表2数据说明GST可诱导鼻咽癌细胞凋亡,且与____ 有关.

③培养动物细胞要用胰蛋白酶或胶原蛋白酶处理动物组织,而培养癌细胞不需要相关酶处理的原因是癌细胞膜上的____ 等物质减少,易游离而从癌组织转移出去.