Many firms give away small quantities of their productions as so that people can try them before buying.
A. signs
B. signals
C. examples
D. samples
网友回答
A. signs
B. signals
C. examples
(答案→)D. samples
解析：句意，许多公司赠送少量的他们公司生产的产品作为样品，这样人们在买之前就可以试用。Signs记号 signals信号examples例子samples样品，根据题意，故选D。