We __________ so tired. We've only been

题型:选择题

问题:

We __________ so tired. We've only been to a party.

A.mustn't have felt

B.wouldn't have felt

C.shouldn't have felt

D.couldn't have felt

考点:虚拟语气情态动词
题型:选择题

关于数据库系统中的数据的静态转储和动态转储机制,下述说法正确的是______。

A.静态转储时允许其他事务访问数据库

B.动态转储时允许在转储过程中其他事务对数据进行存取和修改

C.静态转储能够保证数据库的可用性

D.动态转储无法保证数据库的可用性

题型:选择题

下列关于文学常识的叙述,有错误的一项是:

A.“传奇”本指情节曲折离奇的唐代文言短篇小说,《柳毅传》即其代表作。

B.“歌”、“行”、“引”都是乐府诗的体式,如《饮马长城窟行》、《茅屋为秋风所破歌》等。

C.“书”可用于下对上,如李斯《谏逐客书》;也可用于平辈之间,如自居易《与元九书》。

D.“赋”盛行于两汉,历魏晋、隋唐,至宋而不衰;其中宋赋受古文影响,倾向散文化,苏洵的《阿房宫赋》即其代表作。

题型:选择题

计算并验算

24.83-17.2

76.04+45.79.

题型:选择题

血液中的胆红素最主要来源于()

A.血红蛋白分解

B.肌红蛋白分解

C.过氧化物酶分解

D.过氧化氢酶分解

E.细胞色素分解

题型:选择题

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were available from World Wide Web Sites that seemed to spring up almost daily. A few years earlier, some people had predicted that consumers accustomed to shopping in stores would be reluctant to buy things that they could not see or touch in person. For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient alternative to driving to the store.

A research estimated that in 1998 US consumers would purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, owing to the rise of online auctions and Web sites that did comparison shopping on the Internet for the best deal.

For all the consumer interest, retailing in cyberspace was still a largely unprofitable business, however. Internet pioneer Amazon. com, which began selling books in 1995 and later branched into recorded music and videos, posted revenue of $153.7 million in the third quarter, up from $37.9 minion in the same period of 1997. Overall, however, the company’s loss widened to $45.2 million from $9.6 million, and analysts did not expect the company to turn a profit until 2001. Despite the great loss, Amazon. com had a stock market value of many billions, reflecting investors’ optimism about the future of the industry.

Internet retailing appealed to investors because it provided an efficient means for reaching millions of consumers without having the cost of operating conventional stores with their armies of salespeople. Selling online carried its own risks, however. With so many companies competing for consumers’ attention, price competition was intense and profit margins thin or nonexistent. One video retailer sold the hit movie Titanic for $9.99, undercutting the $19.99 suggested retail price and losing about $6 on each copy sold. With Internet retailing still in its initial stage; companies seemed willing to absorb such losses in an attempt to establish a dominant market position.

Which of the following is true, according to the writer()

A. Consumers are reluctant to buy things on the Internet

B. Consumers are too busy to buy things on the Internet

C. More and more consumers prefer Internet shopping

D. Internet retailing is a profitable business

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