单项选择题

The words Francis Key wrote on the back of an old letter "The Star Spangled Banner" became the national ______ of the United States.

A．song
B．hymn
C．anthem
D．motto
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单项选择题
The doctor recommends me ______ on a strict diet.
A．to go
B．going
C．I should go
D．go
单项选择题
______ plants, which manufacture their own food, animals obtain nourishment by acquiring and ingesting their food.
A．As
B．Different
C．Unlike
D．As many
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