The total width of the Pennsylvania Turnpike is ______.

单项选择题According to Hahn, all the following increase the transmission of AIDS virus EXCEPT ______.

单项选择题Who raised the question who do you say I am

单项选择题According to the author the form of address is not based on ______.

单项选择题The problem with slang and trendy expressions is ______.

单项选择题What do turnpikes’mean