单项选择题

We always lay in a large () of tinned food in winter in case we are snowed up.

A. proportion
B. storage
C. provision
D. supply

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单项选择题

In the first paragraph, the author gives the definitions of some terms in order to ().

A. argue for the similarities between animal societies and human societies
B. smooth out the conflict in human societies
C. distinguish between two kinds of opposition
D. summarize the that characteristic featare of opposition and cooperation

单项选择题

Efforts to reach the injured men have been () because of a sudden deterioration in weather conditions.

A. enforced
B. intensified
C. continued
D. strengthened