题目

保护和利用森林资源的最佳方法（ ） A．封山育林、禁止砍伐                 B．实行有计划的合理砍伐和种植 C．多种植单纯的杉木林                 D．允许林区人民大砍大种而先富起来 答案：B .     Some experts are warning that the step the US government has taken to deal with the current crisis is ______ of much risk. A. ones                     B. one                          C. that                          D. those