第23题: [单项选择]The problems themselves are still not truly strategic because the operation of the global environment is not affected and the survival of civilization is not at stake. A. at risk B. at issue C. pent up D. adhere to 参考答案:A 答案解析:at stake意为“冒险的,有风险的”。A选项:冒险。B选项:在审议中的。C选项:被抑制的,不能自由表达的。D选项:坚持,粘在……上。