【单选题】Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows.【C1】______ , medical authorities express their【C2】______ about the effect of smoking【C3】______ the...
【单选题】Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. Medical authorities express their【B1】about the effect of smoking on the health not only【B2】those ...
【判断题】腐蚀不仅造成经济上的损失,而且不利于自然资源和能源的保护,有时甚至危及人身安全