单项选择题

By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.

A．are living
B．will be living
C．have lived
D．will have lived
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单项选择题
With one leg broken in that car accident, he cannot even walk, ______ run.
A．let alone
B．that's to say
C．not to speak
D．don’t mention it
单项选择题
The ______ of the priest’s sermon was that all human beings should love each other.
A．brain
B．question
C．essence
D．reality
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