单项选择题

To save more money you'll need to be more frugal.

A．lucky
B．intelligent
C．hard-working
D．economical
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单项选择题
How to talk to a Martian is an academic question.
A．a theoretical
B．an educational
C．a scholastic
D．a general
单项选择题
He erased all the pencil marks on the book.
A．left
B．noted
C．wrote
D．rubbed out
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