第20个空填什么？why?

二、完形填空 阅读下面短文，掌握其大意，然后从16到35各题所给的四个选项选出最佳答案。 Chinese scientists are again becoming excited about the 16 that a large hairy animal may live in central China．Now they hope it won’t be too long before they are able to 17 its existence．Their confidence is the 18 of a new discovery of the mystery animal in Hubei Province. The Chinese 19, enjoying a holiday in 20 National Forest Park, were driving down a road．As their bus turned a corner, the men were suddenly 21 by what they saw．Three 22 animals, covered with long dark hair, were crossing the roads．On seeing the animals, the engineers immediately stopped and 23 them.24, when they saw how the animals moved through the forest with great 25 and strength, they did not dare to 26 any further． The men did not take any 27．However, scientists are 28 by the discovery, because the engineers were all well-educated people and scientists feel they can 29 what they described. 30 the discovery, scientists returned to the forest and 31 some hair and measured footprints．About 20 inches appears to be the length of the animal’s 32! Chinese scientists have now set up a special group to exchange information and make a 33 of the forest．But in the meantime, some people 34 to believe that this half-man, half-monkey exists．They will not believe that it is 35 until one of the animals has been caught. 16. A. fact B. matter C. truth D. thing 17. A. prove B. analyze C. protect D. check 18. A. basis B. requirement C. result D. preparation 19. A. travelers B. engineers C. scientists D. explorers 20. A. the B. another C. a D. one 21. A. frightened B. amazed C. upset D. inspired 22. A. trained B. rejected C. tall D. violent 23. A. shot at B. looked at C. fought with D. ran after 24. A. However B. Indeed C. Meanwhile D. Anyway 25. A. difficulty B. speed C. care D. pleasure 26. A. search B. follow C. find D. look for 27. A. bullets B. tools C. medicines D. photographs 28. A. surprised B. delighted C. disturbed D. supported 29. A. rely on B. deal with C. write down D. pass on 30. A. With B. As C. Because D. After 31. A. cut B. pulled C. collected D. tore 32. A. foot B. leg C. body D. head 33. A. film B. tour C. choice D. study 34. A. come B. refuse C. prefer D. have 35. A. wrong B. alive C. real D. correct

解题思路： 冠词的用法
解题过程：
选A the National Forest Park 国家森林公园 普通名词构成的专有名词前加定冠词。
最终答案：略