题目

三峡大坝建成并蓄水后，有些生物的生存受到了严重威胁。为了挽救这些生物，最好采取下列哪项措施？ A.建立自然保护区                 B.将受到威胁的生物易地保护 C.制定生物多样性保护的法律和政策  D.开展生物多样性保护方面的科学研究和宣传教育 答案：B30.[2001上海] I really appreciate ________ to relax with you on this nice island. A. to have had time B. having time C. to have time　　   D. to having time