凡影响行车施工、维修作业，不得利用列车间隔、进行特别规定的慢行施工除外，都必须纳入（

X线片上拔牙窝的影像完全消失至出现正常骨结构的时间是在牙拔除后约

A．6～8周

B．3～6个月

C．7～10个月

D．11～12个月

E．1年以上

教育储蓄的优点不包括( )。

A．风险小

B．收益稳定

C．享受税收优惠

D．数额大

男性，52岁，因慢性肾衰竭，在连续硬膜外麻醉下行肾移植手术，该手术的麻醉阻滞平面应达到（）

A.T以上

B.T以上

C.T以上

D.T以下

E.T以下

车载式颠簸累积仪测量车辆在路面通行时，后轴与车厢之间的单向位移累积值表示路面平整度。( )

Shopping has always been something of an impulse activity, in which objects that catch our fancy while strolling are immediately bought on a whim. Advertisers and sellers have taken advantage of this fact, carefully positioning inexpensive but attractive items on paths that we are most likely to cross, hoping that our human nature will lead to a greater profit for them. With the dawn of the Internet and its exploding use across the world, the same tactics apply.

Advertisers now place "banners", links to commercial web sites decorated with attractive pictures designed to catch our eyes while browsing the webs, on key web sites with heavy traffic. They pay top dollar for the right, thus creating profits for the hosting web site as well. These actions are performed in the hopes that during the course of our casual and leisurely web surfing, we’ll click on that banner that sparks our interest and thus, in theory, buy the products advertised.

Initial results have been positive. Web sites report a huge inflow of cash, both from the advertisers who tempt customers in with the banners and the hosting web sites, which are paid for allowing the banners to be put in place. As trust and confidence in Internet buying increases and information security is heightened with new technology, the volume of buying is increasing, leading to even greater profits.

The current situation, however, is not quite as optimistic. Just as magazine readers tend to unconsciously ignore advertisements in their favorite periodicals, web browsers are beginning to allow banners to slip their notice as well. Internet users respond to the flood of banners by viewing them as annoyances, a negative image that is hurting sales, since users are now less reluctant to click on those banners, preferring not to support the system that puts them in place. If Internet advertising is to continue to be a viable and profitable business practice, new methods will need to be considered to reinvigorate the industry.

With the recent depression in the technology sector and slowing economy, even new practices may not do the trick. As consumers are saving more and frequenting traditional real estate businesses over their Internet counterparts, the fate of Internet business is called into question. The coming years will be the only reliable indication of whether shopping on the World Wide Web is the wave of the future or simply an impulse activity whose whim has passed. (404 words)

Notes: on a whim 心血来潮。surf v.冲浪。in theory在理论上，顺理成章。hosting 访问率离的。call...into question 质疑，对……提出疑问。

The expression "do the trick" in the last paragraph most probably means（）

A. come to the point

B. fulfill their purpose

C. fail of their success

D. live up to their promise