单项选择题

The ______ of human knowledge are being pushed further.

A．boundaries
B．borders
C．limits
D．edges
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单项选择题
This ticket ______ you to a free meal in our new restaurant.
A．entitles
B．grants
C．gives
D．credits
单项选择题
Mary is always ______ when she doesn't get any mail.
A．affected
B．worried
C．puzzled
D．disturbed
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