However, recognizing employers' power over workers as a central factor in African Americans' economic marginalization, African American workers saw the need to join with White workers in seeking change despite White unionists' toleration of or support for racial discrimination.
In the 1980's, however, Bakker's contention began to be questioned, as a number of scientists found growth rings in the bones of various dinosaurs that are much like those in modern reptiles.
原文even though local iron concentrations increased immediately
和
选项ocean currents displaced the iron-rich water from the surface
真的不矛盾吗？原文规定浓度高了，选项说漂走了，浓度还怎么高？做题的时候就郁闷了半天
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A、B同时出现，一定不对，选C，basis，E 没有competitive优势