关节附近骨折，骨膜剥离形成较大骨膜下血肿、机化、钙化后可致（）
A．脂肪栓塞
B．缺血性骨坏死
C．缺血性肌挛缩
D．创伤性关节炎
E．骨化性肌炎(损伤性骨化)
参考答案：E
解析：
关节扭伤、脱位及关节附近的骨折，若处理不当，致使局部出血过多，积血剥离骨膜并渗入受损的肌纤维间，血肿机化后，逐渐转变为钙化骨，导致疼痛，关节功能严重障碍。称为损伤性骨化(骨化性肌炎)。
| 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. |
On the whole, this passage is positioned to dwell on______.
A．the overall picture of the HDTV sector
B．how the giant TV makers should offer better products
C．a lament over consumers’ inability to use a high-end TV set
D．a criticism of the.TV makers for doing nothing about a big problem