A-A+
The word concentrations in the passage is clos
问题详情
The word concentrations in the passage is closest in meaning to
A．protections
B．numbers
C．confidence
D．support请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
解析：In this passage, numbers is a synonym for "concentrations." Context comes from the references in previous sentences to "percentage" and "number."
