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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热门试题

单项选择题

The ingredient missing from milled rice______.

A．was vitamin B
B．did not affected the chickens
C．was named the Eijkman vitamin
D．has never been accurately identified

单项选择题

In this passage the author argues that ______.

A．efficiency must be raised in the poultry industry
B．raising poultry can provide more protein than growing grain
C．factory fanning will do more harm than good to developing countries
D．hungry nations may benefit from the development of the poultry industry