单项选择题 According to those against killing wolves，when wolves eat other animals， ． A．they never eat strong and healthy ones B．they always go against the law of nature C．they might help this kind of animals survive in nature D．they disturb the ecological balance in the wilderness

单项选择题 对有机含量较多的土、硫酸盐含量（）的土及重黏土，不宜用水泥来稳定。

单项选择题 The last sentence“And everyone knows what happens next”implies that in such cases ．A．farm animals will be in danger and have to be shipped away B．woIves will kill people and people will in turn kill themC．wolves wilI find enough food sources on famlsD．people will leave the areas where wolves can live