【简答题】Section 3 questions 21-30 Questions 21-26 Choose the correct letter, A, B or C. 21 The subjects in questionnaire are A tourists in the hotel in this area B local residents C people who are living in t...
【简答题】Answer the following questions in English according to the text: (1)What is a catchment area? (2) Why should it be done to check the rainfall records and the runoff and infiltration values with the re...