单项选择题 Danis Hayes raised the essential paradox and asked how people could have fought so hard against environmental degradation（）themselves now on the verge of losing the war．

单项选择题 He has courage all right, but in matters requiring judgment, he has often been found sadly（）

单项选择题 He had a (n) （）habit of emptying ash trays out of his upstairs window on to our doorsteps.