反垄断法明确规定，具有市场支配地位的经营者，不得滥用市场支配地位，排除、限制竞争。从经济生活角度看，之所以做出这样的规定，主要是因为[ ]

A、市场经济存在竞争，一切竞争都受到法律的保护

B、兼顾效率与公平是社会主义市场经济的基本标志

C、良好的市场秩序依赖市场规则来维护

D、行政手段是国家宏观调控的主要手段

The modern Olympic Games were founded with the intention of improving health and education, promoting world peace, and encouraging fair and equal competition. But over the years, the Olympic saying, "faster, higher, per", has pushed scientists as well as athletes to do everything possible to reach new levels.
Doctors, engineers and coaches all use everything science has to offer to achieve that little bit extra in competition. The reason modern technology has become part of sport is very simple: winning is just as important as it was 2,500 years ago at the Olympics of ancient Greece.
Developments in technology have often been reflected in the methods of training and performance used at the Olympics through history. This technology falls into two main groups: improving an athlete’s performance in competition, and allowing results to be measured more accurately.
The introduction of high-tech equipment means that athletes in all sports, from the 100-metres sprint to the pole vault, can now train more effectively and nourish their bodies better.