清华大学博士考试英语试题及答案清华大学博士考试英语试题及答案Part Listening Comprehension (20%)(略）Part Vocabulary (10%)Directions: There are 20 incomplete sentences in this part. For each sentence there are four choices marked A, B, C and D. Choose the best one that completes the sentence and then mark the corresponding letter on the ANSWET SHEET with a single line through the center.21. The_of the spring water attracts a lot of visitors from other parts of the country.A. clashB. clarify
