观察意外死亡在不同年份的变化趋势，宜选择的图形为（）。 A.直方图 B.直条图 C.

A total of 4.6 million digital televisions have been sold, and the sales of HDTV sets have quadrupled since last year. Consumers have bought HDTVs to play their DVDs and to have clearer pictures and wide screens. Only a small percentage of the people who have purchased HDTVs, however, have actually ^hooked their TVs up# to receive high-definition television digital signals. Perhaps television viewers are having trouble keeping up with the changes in technology. Even the manufacturers of HDTVs, like Mitsubishi, Thomson Multimedia, Sony, and Samsung seem to have a tough time learning how to make their sets work with the various digital TV formats because little standardization has been required or implemented in the industry.Some of the HDTVs weigh over 200 lbs., and a variety of retailers offer a delivery service to the buyer’’s home to help install the heavy sets. This is known as a white-glove service and usually comes with an extra fee. After HDTV purchasers get their sets home and hook them up, they will still need to work to get the digital signals to their systems. Most of the industry’’s cable providers do not yet offer high-definition programing, and only about 15% of commercial television stations have switched over to even the lowest improved digital pictures. Worse yet, viewers may need to install antenna before they can even get the digital signals to their new HDTV sets. Another frustration for home-theater seekers is that the current HDTV sets allow owners only to watch high-definition programs, not to record them.

Hook up as in "hooked their TVs up" in Paragraph 1 most probably means to________.

A．have a hood over the TV

B．be connected to

C．relate oneself to

D．keep contact with

（）模型揭示了劳动力市场的基本功能。

A.收支循环

B.支出循环

C.供需循环

D.收入循环

男，36岁。车祸2小时。查体：一般情况尚可，右小腿有一长约16cm的伤口，胫骨断端外露。出血不多，并伴有广泛的软组织挫伤。

在摄X线片以前，应先进行的处理是（）

A.行简单的外固定及局部包扎

B.止血带止血

C.清创术

D.跟骨结节牵引

E.紧急输血、输液

（）味是咖啡最基本的口味。

居室细菌学评价最常用的指标是（）

A.金黄色葡萄球菌

B.细菌总数

C.大肠杆菌

D.粪大肠杆菌

E.志贺菌属