第34题: [单项选择]Some concrete actions were taken to improve the living conditions there but proved to be __________. A. at a premium B. to no avail C. of their own accord D. on the alert 参考答案:B 答案解析:采取了一些具体的措施来改善那里的生活条件,但是不见效果。本题是考查介词词组的用法。at a premium“奇缺的,难得的”;to no avail“完全无用”;of one's own accord