题目内容
（请给出正确答案）
A.power
B.efficiency
C.effective power
D.power factor
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Nonetheless, many companies still hesitate to use the Web because of doubts about its reliability. "Businesses need to feel they can trust the pathway between them and the supplier," says senior analyst Blanc Erwin of Forrester Research. Some companies are limiting the risk by conducting online transactions only with established business partners who are given access to the company's private intranet.
Another major shift in the model for Internet commerce concerns the technology available for marketing. Until recently, Internet marketing activities have focused on strategies to "pull" customers into sites. In the past year, however, software companies have developed tools that allow companies to "push" information directly out to consumers, transmitting marketing messages directly to targeted customers. Most notably, the Pointcast Network uses a screen saver to deliver a continually updated stream of news and advertisements to subscribers' computer monitors. Subscribers can customize the information they want to receive and proceed directly to a company's Web site. Companies such as Virtual Vineyards are already starting to use similar technologies to push messages to customers about special sales, product offering, or other events. But push technology has earned the contempt of many Web users. Online culture thinks highly of the notion that the information flowing onto the screen comes there by specific request. Once commer-cial promotion begins to fill the screen uninvited, the distinction between the Web and television fades. That's a prospect that horrifies Net purists.
But it is hardly inevitable that companies on the Web will need to resort to push strategies to make money. The examples of Virtual Vineyards, Amazon.com, and other pioneers show that a Web site selling the right kind of products with the right mix of interactivity, hospitality, and security will attract online customers. And the cost of computing power continues to free fall, which is a good sign for any enterprise setting up shop in silicon. People looking back 5 or 10 years from now may well wonder why so few companies took the online plunge.
What do we learn about the present web business?
A．Web business is no longer in fashion.
B．Business-to-business sales are the trend.
C．Web business is prosperous in the consumer market.
D．Many companies still lack confidence in web business.
present-day St.Louis，and it radiated out to encompass most of the Mississippi watershed，from Wisconsin to Louisians and from Oklahoma to Tennessee.Thousands of villages were included in its orbit.By about AD.700 this Mississippian culture，as is known to archaeologists，began to send its influence eastward to transform. the life of most of the less technologically advanced woodland tribes.Like the Mound Builders of the
Ohio region，these tribes，probably influenced by Meso-American cultures through trade and warfare，built gigantic mounds as burial and ceremonial places.The largest of them，rising In four terraces to a height of one hundred feet，has a rectangular base of nearly fifteen acres，larger than that of the Great Pyramid of Egypt.Built between AD.900 and 1100 this huge earthwork faces the site of a palisaded (用栅围护) Indian city which contained more than one hundred small artificial mounds marking burial sites.Spread among them was a vast settlement containing some 30 000 people by current estimations.The finely crafted ornaments and tools recovered at Cahokia，as this center of Misissippi culture is called，
include elaborate ceramics (陶器) finely sculpted stonework，carefully embossed and engraved copper and mica (云母) sheets，and one funeral blanket fashioned from 12 000 shell beads.They indicate that Cahokia was a true urban center，with clustered housing，markets，and specialists in toolmaking，hide-dressing，potting，jewelry-making，weaving，and salt-making.
1.What is the main topic of the passage?()
A.The Mississippian culture
B.The decline of Mound Builder culture
C.The architecture of Meso-American Indians
D.the eastern woodlands tribes.
2.The paragraph preceding this one most probably discussed.()
A.the Mound Builder culture
B.warfare in AD.500
C.the geography of the Mississippi area
D.agriculture near the Mississippi River
3.In relation to the Mississippian culture，the Mound Builder culture was located().
A.in essentially the same area
B.farther south along the watershed
C.to the east
D.to the west
4.The Mississippian culture influenced the culture of the().
A.eastern woodland tribes
B.Mound Builders
C.Meso-Americans
D.Egyptians
5.According to the passage，the mounds were used as().
A.palaces for the royal families
B.fortresses for defense
C.centers for conducting trade
D.places for burying the dead
A、request
B、strong
C、satisfactory
D、shipper
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