单项选择题

Nowadays, we can purchase things on-line.

A．read
B．buy
C．rent
D．watch
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单项选择题
Yet in one way they are really so fortunate.
A．to some extent
B．in the way
C．by the way
D．just then
单项选择题
I have heard this tune before, but I don't know the words to the song.
A．theme
B．rhyme
C．melody
D．lyric
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