我已了解清楚，她的结论是以事实为根据的。

A．need
B．want
C．absence
D．shortage

A．Passengers had a lot of vegetables, but no fruit.
B．The sailors had four tins of beer a day.
C．The people on the ship often fell iii because of the lack of food.
D．The food for the passengers was more and better than that for the crew.