12. A. for B. with C. out D. at

13. A. decision B. duty C. goal D. religion

14. A. tests B. school C. failure D. danger

15. A. consulted B. realized C. left D. neglected

16. A. that B. what C. how D. why

17. A. make B. save C. help D. warn

18. A. education B. mistake C. challenge D. atmosphere

19. A. reflections B. consequences C. meanings D. reasons

20. A. famous B. proud C. regretful D. responsible

II.阅读理解

　　阅读下面短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

　　When Michael Phelps announced his retirement at the 2016 Rio Olympics he really had no intention of swimming competitively again. However, that changed when he was approached by the Discovery Channel to help kick off Shark Week with a race against one of the world's fastest predators(捕猎者) - a great white!

　　To prepare for the big event, Phelps, having won 28 Olympic medals, practiced by racing against a reef and a hammerhead shark(锤头鲨) - both computer generated. While the swimmer's time of 18.7 seconds was enough to beat the reef shark by 0.2 seconds, he fell behind the hammerhead, which completed the 50-meter distance in 15.1 seconds.

　 On July 23 at 7:00 pm, over five million viewers, including swimming fans, shark fans, Phelps fans tuned in to watch the highly expected Phelps vs Shark. To compete effectively against the fish that can swim at speeds of up to 25 mph, Phelps wore a custom wetsuit(潜水服). It was not only designed to reduce drag, but also featured a fin to mimic the shark's powerful tail.

　　While television viewers saw the competitors swimming side by side, Phelps raced by himself in the cold Atlantic waters. The Discovery Channel film crew then inserted his computer-generated opponent simulating a real shark's speed.

　 Though Phelps managed to complete the distance in an impressive 38.1 seconds, he was no match for the great shark, which clocked 36.1 seconds. Like a true champion, the fish celebrated the victory by leaping out of the water. Phelps, meanwhile, took the loss in good humor, tweeting: ＂Rematch? Next time...warmer water.＂

Some fans were disappointed that Phelps did not race a live shark in the ocean, although that would have been dangerous for the swimmer. Given that it was the highest-rated Shark Week special in the program's 29-year history,