这个题解释的不应该是为什么researcher没有提出为什么在环境污染厉害的地方这个虫子对willow的伤害大吗？E为啥不对，可能是因为willow生长范围的问题没有对照组不能知道为什么

@唐瑭老师 请问为什么选B而不是A？我一直在A和B之间犹豫 排除B是因为：Martin's exclusion 只说明M并没有把气候变化包含进去（exclude），不代表deny了。我认为deny程度太重，因此排除。且A看起来符合逻辑：第一个理论就是说P狩猎导致物种灭绝。

a construction company was paid a total of 500000 for a construction project. the company's only costs for the project were for labor and materials. was the company's profit for the project greater than 150000? (1) the company's total cost was three times its cost for materials (2) the company's profit was greater than its cost for labor answer is C