问题 单项选择题

I came across an old country guide the other day. It listed all the tradesmen in each village in my part of the country, and it was impressive to see the great variety of services which were available on one’s own doorstep in the late Victorian countryside.

Nowadays a superficial traveler in rural England might conclude that the only village tradesmen still flourishing were either selling frozen food to the inhabitants or selling antiques to visitors. Nevertheless, this would really be a false impression. Admittedly there has been a contraction of village commerce, but its vigor is still remarkable.

Our local grocer’s shop, for example, is actually expanding in spite of the competition from supermarkets in the nearest town. Women sensibly prefer to go there and exchange the local news while doing their shopping, instead of queueing up anonymously at a supermarket. And the proprietor knows well that personal service has a substantial cash value.

His Prices may be a bit higher than those in the town, but he will deliver anything at any time. His assistants think nothing of bicycling down the village street in their lunch hour to-take a piece of cheese to an old-age pensioner who sent her order by word of mouth with a friend who happened to be passing. The more affluent customers telephone their shopping lists and the goods are on their doorsteps within an hour. They have only to hint at a fancy for some commodity outside the usual stock and the grocer, a red-faced figure, instantly obtains it for them.

The village gains from this sort of enterprise, of course. But I also find it satisfactory because a village shop offers one of the few ways in which a modest individualist can still get along in the world without attaching himself to the big battalions of industry or commerce.

Most of the village shopkeepers I know, at any rate, are decidedly individualist in their ways. For example, our shoemaker is a formidable figure: a thick-set, irritable man whom children treat with marked respect, knowing that an ill-judged word can provoke an angry eruption at any time. He stares with contempt at the pairs of cheap, mass-produced shoes taken to him for repair: has it come to this, he seems to be saying, that he, a craftsman, should have to waste his skills upon such trash But we all know he will in fact do excellent work upon them. And he makes beautiful shoes for those who can afford such luxury.

The local grocer’s shop is expanding even though () .

A.town shops are more attractive

B.town shops are larger and less well-known

C.people like to shop where they are less well-known

D.people get extra service in townshops

答案

参考答案:B

解析:

这是道句意理解题,可以通过排除法得出答案。A项中的attractive是个模糊词,且不符合题干中even though的意义,C项不属于普遍现象,D项文中并未提及,只有B项是具体的,且符合题干要求。

实验题

某研究小组对用过氧化氢分解生成水和氧气的实验条件进行探究。

[提出问题]哪些因素可能影响该反应的反应速率?

(1)[作出猜想]下面是小组内三位同学所做的猜想,请你完成小明的猜想。

小芳同学:H2O2溶液的浓度可能影响该反应的反应速率

小华同学:催化剂(MnO2)的用量可能影响该反应的反应速率

小明同学:我认为                            可能影响该反应的反应速率

[实验验证]

(2)小芳同学的实验是:每次均取10mL30%的H2O2溶液,然后稀释成不同浓度的溶液进行实验,测定各次收集到100mL氧气时所用的时间,记录数据如下:(其他实验条件:温度、催化剂用量等均相同)

请你分析回答:

H2O2溶液的浓度对过氧化氢分解制氧气反应速率有什么影响?                                                             

(3)小华同学的实验是:每次均用30mL10%的H2O2溶液,采用不同量MnO2粉末做催化剂,测定各次收集到500mL氧气时所用的时间,结果如下:(其他实验条件:过氧化氢溶液浓度、温度等均相同)

请你分析回答:该反应的化学方程式为__________________________;催化剂MnO2的用量对过氧化氢分解制氧气反应速率有什么影响? ______________________________________________________________

(4)如果你是小明同学,在验证你的猜想时,你的实验方案是:                                                         

[反思与交流] 通过该探究实验,你还想探究的问题或还想学习的知识是                                               

单项选择题