单项选择题

It is vital that food and shelter are made ______ for people in the flood-stricken area.

A．free
B．useful
C．available
D．usable
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单项选择题
Mrs. Douglas unknowingly left a package ______ on the shop counter.
A．laying
B．to lie
C．laid
D．lying
单项选择题
The first ______ in the development of civilized man were probably the invention of primitive weapons and the discovery of fire.
A．intervals
B．breaks
C．stages
D．periods
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