单项选择题

Small farms and the lack of modem technology have ______ agricultural production.

A．blundered
B．tangled
C．mingled
D．hampered
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单项选择题
A. peculiarly pointed chin is his most memorable facial ______.
A．mark.
B．feature
C．sign
D．appearance
单项选择题
Fest-food restaurants are ______ to those who are too busy or too tired to cook dinner for the family.
A．great helps
B．a great help
C．great help
D．of a great help
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