According to this passage, all of the following factors could account for brain shrinkage except______.

单项选择题In Shakespeare' s famous play Romeo and Juliet, what were Romeo' s and Juliet' s surnames

单项选择题The original American flag contains 13 horizontal stripes and 13 white stars arranged ______ to symbolize unity and equality of those colonies.

单项选择题The so-called Glorious Revolution of 1688 took place in______.

单项选择题In1066, England was invaded by ______.

单项选择题The American National Anthem is______.