What was the ratio of males to females born in the past?
答案解析
This question is testing the recall of specific information from the passage. The correct answer is 'B' because the passage states that there were about 105 males born for every 100 females. Option 'A' is incorrect because it reverses the ratio given in the passage. Option 'C' is incorrect because it suggests equality, which is not stated. Option 'D' is incorrect because it suggests an equal number without specifying the ratio.
正确答案：B