问题 单项选择题

生理学研究发现的令人不安的证据表明,许多结构性紊乱症与慢跑有关。与这项流行的运动明显相关的疾病有椎间盘脱出、压迫性足踝骨折、膝胯关节损伤和肌腱炎。此外,这些疾病不只是发生在初习者中,经常锻炼的人也有相同比例的患者。这些累计的数据表明,人体的骨骼不足以承受慢跑所带来的压力。 以下哪项是上述论证所必须假设的

A.慢跑与一定的结构性紊乱之间的关联体现了某种因果关系。

B.慢跑比其他的运动导致更严重的紊乱症。

C.慢跑者的经验水平是决定慢跑损伤的可能性的一个因素。

D.对人的体格来说,有些运动比慢跑更安全。

E.人类这一物种不是非常有耐力的。

答案

参考答案:A

解析:慢跑与结构性紊乱之间必须具有因果联系。

解答题
单项选择题

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