理化因素所致疾病的诊断原则除外（） A.病因  B.靶部位  C.剂量与效应关系

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 (夺回) 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. become unstable

C. improve enormously  

D. remain at the same level

2. The first paragraph tells us that a new product is________.

A. usually introduced to satisfy different tastes

B. often more expensive than old ones

C. often inferior to old ones at first

D. not easily accepted by the public

3. 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

4. The author mentions the example of "backpacks" (Line7,Para.2) to show the importance of _____.

A. increasing usage among students

B. pleasing the young as well as the old

C. exploring new market sections

D. serving both military and civil needs

5. In order to recover their share of the world market,US auto makers are________.

A. improving product quality

B. re－positioning their product in the market

C. modernizing product style

D. increasing product features