单项选择题

Pine trees, of which them am almost one hundred ______, are found throughout the North Temperate Zone.

A．species
B．differences
C．similarities
D．standards
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单项选择题
My favorite radio song is the one I first heard on a thick 1923 Edison disc I ______ at a garage sale.
A．trifled with
B．scraped through
C．stumbled upon
D．thirsted for
单项选择题
______ his sister, Jack is quiet and does not easily make friends with others.
A．Dislike
B．Unlike
C．Alike
D．Liking
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