问题 选择题

炭雕(主要成分是木炭)是体重集观赏与空气净化于一体的工艺品。下列关于它的说法中错误的是

A.炭雕工艺品须特别注意防火

B.炭雕是轻质透明且不易变质的固体

C.碳的性质比较稳定,炭雕艺术品可以长期保存

D.炭雕能吸附室内微量有害气体,有利健康

答案

答案:B

A、木炭具有可燃性,离火太近,会使其达到着火点而燃烧,故A正确,

B、由碳元素形成的单质中,金刚石是无色透明的,木炭是黑色,它不会是透明的,故B错误,

C、在常温下,碳的化学性质稳定,木炭是有碳元素组成的,性质也较稳定,故C正确,

D、木炭具有吸附性,可以吸附色素和异味,故D正确.

故选B.

阅读理解

阅读理解。

     We can see how the product life cycle works by looking at the introduction of instant coffee. When it

was introduced, most people did not like it as well as "regular" coffee, and it took several years to gain general

acceptance (introduction stage). At one point, though, instant coffee grew rapidly in popularity, and many

brands were introduced (stage of rapid growth). After a while, people became attached to one brand and

sales leveled off (stage of maturity). Sales went into a slight decline when freeze-dried coffees were

introduced (stage of decline).

     The importance of the product life cycle to marketers is this: Different stages in the product life cycle

call for different strategies. The goal is to extend product life so that sales and profits do not decline. One

strategy is called market modification. It means that marketing managers look for new users and market

sections. Did you know, for example, that the backpacks that so many students carry today were originally

designed for the military?

     Market modification also means searching for increased usage among present customers or going for a

different market, such as senior citizens. A marketer may re-position the product to appeal to new market

sections.

     Another product extension strategy is called product modification. It involves changing product quality,

features, or style to attract new users or more usage from present users. American auto manufacturers are

using quality improvement as one way to recapture world markets. Note, also, how auto manufacturers once

changed styles dramatically from year to year to keep demand from falling.

1. According to the passage, when people grow fond of one particular brand of a product, its sales will _____.

A. decrease gradually

B. remain at the same level

C. become unstable

D. improve enormously

2. Marketers need to know which of the four stages a product is in so as to _____.  

A. work out marketing policies

B. promote its production  

C. increase its popularity

D. speed up its life cycle

3. The author mentions the example of "backpacks" in paragraph two to show the importance of _____.

A. pleasing the young as well as the old

B. increasing usage among students

C. exploring new market sections

D. serving both military and civil needs

4. In order to recover their share of the world market, U.S. auto makers are _____.

A. improving product quality

B. increasing product features

C. modernizing product style

D. re-positioning their product in the market

问答题 简答题