在汇编语言中，变量是一个数据存储单元的名字，即数据存放地址的符号表示。

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were (1) from World Wide Websites that seemed to (2) almost daily a few years earlier, some people had predicted that consuners accustomed to shopping in stores would be (3) to buy things that they could not see or touch (4) . For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient (5) to driving to the store.

A research estimated that in 1998 US consumers could purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, (6) the rise of online auctions and Websites that did comparison shopping on the Internet for the best (7) .

For all the consumer interest, (8) in eyberspaee was still a largely (9) business, however. Internet pioneer Amazon. eom, which began selling books in 1995 and later (10) into recorded music and videos, posted (11) of $ 153.7 million in the third quarter, up from $ 37.9 million in the same period of 1997. Overall, (12) , the company’ s loss widened to $ 45.2 million from $9.6 million, and analysts did not expect the company to turn a profit (13) 2001. (14) the great loss, Amazon. tom had a stock market value of many billions, reflecting investors’ (15) about the future of the industry.

Internet retailing appealed (16) investors because it provided an efficient means for reaching millions of consumers without having the cost of operating (17) stores with their armies of salespeople. Selling online carried its own risks, however, (18) so many companies competing tor consumers’ attention, price competition was (19) and profit (20) thin or nonexistent.

4（）

A.in all

B.in person

C.before hand

D. in reality

用如图所示装置进行CO和CO₂的分离与干燥（其中A为弹簧夹，B为分液漏斗活塞）．

已知：浓硫酸具有很强的吸水性；氢氧化钠溶液可以快速吸收二氧化碳，

（1）若将二氧化碳通入足量的氢氧化钠溶液可以生成碳酸钠和水，该反应的化学方程式为

_______________________________

（2）广口瓶（甲）中盛有_________ ；广口瓶（乙）中盛有浓硫酸，其作用是_________ ；分液漏斗（丙）中盛有___________ ．

（3）先分离出的气体是_________；丙中液体将后一种气体分离出时发生反应的化学方程式为__________________________。

可减少霍乱腹泻量及缩短排菌时间的治疗是（）。

A.抗菌治疗

B.补液治疗

C.糖皮质激素的使用

D.血管活性药物的使用

E.强心治疗

麻醉废气清除系统的处理装置，下列说法哪些正确（）

A.被动清除时是以患者自身的呼吸作为驱动力

B.被动清除时处理管口防止阻塞

C.被动清除处理管气流阻力不能大于10cmH₂O

D.被动清除的处理管外口置于排风扇装置邻近排气效果更好

E.主动清除的废气处理管要尽可能粗

关于增值税小规模纳税人的认定，下列说法不正确的是( )。

A．从事货物生产或者提供应税劳务的纳税人，以及以从事货物生产或者提供应税劳务为主，并兼营货物批发或者零售的纳税人，年应征增值税销售额在50万元以下(含50万元)的，为增值税小规模纳税人

B．商业企业年应税销售额在80万元以下(含80万元)的，为增值税小规模纳税人

C．年应税销售额超过小规模纳税人标准的其他个人按小规模纳税人纳税

D．非企业性单位、不经常发生应税行为的企业按小规模纳税人纳税