(2016·海南省五校模拟)For ages, sailors have said that it is a good luck to see dolphins swum alongside boats. Their presence meant that land is near, which will be vital informations if a boat and her crew are in danger. Some dolphins have even protected sailors which suffer shipwreck from sharks. There is no wonder that these unique and fascinating creatures have long known as our friends.

　　Dolphins are thought to be intelligent animals because of its quick ability to learn. They communicate through a combination of whistles and clicks. While scientists don't know exact what they are talking about, it is thought that dolphins are telling each other that food is nearby, or warning each other for approaching danger.

　　题组(三)

　　Ⅰ.语法填空

　　(2016·湖北省七校联考)A triathlon (三项全能运动) is a sports event which combines three sports, __1__(typical) running, biking, and swimming. During a triathlon, athletes finish all three sports without stopping __2__(beat) the clock. People of all ages and sizes can compete in triathlons. But much like other sports events, a lot of professional __3__(compete) rule the triathlon world. In addition, many triathlons __4__(hold) to benefit charity, much like marathons.

　　The modern triathlon appeared in California in __5__ 1970s. It usually begins with the swimming, __6__(follow) by cycling, and finally running. A triathlon tests the endurance (忍耐力) and speed of an athlete, as well as his or her ability to keep energy and focus __7__ the race as a whole. A triathlon competes against a clock, rather than against other athletes. A variation of the triathlon is a relay triathlon, __8__ a different athlete completes each stage.

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