题目

读长江流域图，完成20、21题。 20.长江最大的水利枢纽工程a是（ ） A.小浪底                     B.葛洲坝               C.二滩                  D.三峡 21.最长的支流b是（ ） A.嘉陵江                     B.湘江                  C.赣江                  D.汉江 完成句子，使改写后的句子完整，并与原句意思相符，注意每空只填一个单词。 1. What’s your last name?    What’s your ________ ________? 2. Can I help you?.    ______ can I _______ for you? 3. Thank you for your letter.    _________ for _______ a letter to me. 4. How much are the pants? _______ __________ ________ ________ these pants? 5. He often helps me with English.    He often helps me ______ _________.