题目内容：
根据下面材料，回答题。The Shanghai Technical Supervision Bureau recently released the results of a sample survey of 486 Model computers being sold in the city's markets. The survey revealed that nine of 14 types, or 64 percent of imported brand-name computers fulfilled the standards.
A large number of the low-quality "foreign" computers which were marketed as world-famous brands were actually counterfeited shoddy products lacking the necessary information such as registered trademarks, factory of origin, quality certifications and safety indices.
In addition, a survey of Shanghai footwear markets conducted by the Bureau on 30-odd occasions since early this year indicated various brands of "foreign shoes", including Nike and Puma, were low-quality counterfeited goods. The allegedly world-famous brands, priced between 300-500 Yuan per pair, were actually worth only 40-60 Yuan.
An official from the China Consumer Association pointed to the following complaints concerning "foreign goods": Quality problems related to individual commodities have developed into a universal problem directly relate to batch shipments of commodities. It is thus quite obvious that the crackdown on counterfeit shoddy foreign goods is a task requiring the utmost immediacy.
The appearance of shoddy counterfeit foreign goods has adversely affected the normal operations of China's real foreign-goods markets, has greatly harmed the interests of consumers and resulted in substantial losses in state tax revenue. Officials have pointed out that the key to cracking down on counterfeit foreign goods is to attack illegal acts related to selling sham (虚假的) foreign goods at the prices applicable for authentic products.
Officials recommend that commodity inspection, technical supervision and industrial and commercial departments should strengthen law enforcement efforts, increase the frequency, of inspections, and eliminate the sources of sham foreign goods.
Enterprises producing and marketing sham foreign goods should be subject to severe punishment, with all cases referred to the judicial departments for adjudication, and public supervision should be intensified.
Consumers, on the other hand, should make every effort to constantly enhance their ability to discern counterfeit foreign goods, and should refrain from blindly purchasing such products simply because of their low price.
The sample survey on computers discovered that__________. A．four hundred and eighty-six computers were counterfeited ones
B．64 percent of the imported computers were low-quality shoddy products
C．nine types of imported computers were up to the standard of their brands
D．large numbers of low-quality computers had been imported
参考答案：
答案解析：