单项选择题

According to the author, in factory, vegetable food______.

A．is easy for chickens to digest
B．is insufficient for the needs of poultry
C．is fully utilized in meat and egg production
D．is inefficiently converted into meat and eggs

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单项选择题

The word carcass ( Line 2, Para. 3) most probably means ______

A．vegetables preserved for future use
B．the dead body of an animal ready to be cut into meat
C．expensive food that consumers can hardly afford
D．meat canned for future consumption