Recent studies have shown that most US graduates receive cash as gifts, though the amount received from person to person．
A. prefers
B. promotes
C. varies
D. suffers
网友回答
A. prefers
B. promotes
(答案→)C. varies
D. suffers
解析：词义辨析。 A．更喜欢 B．促进 C．改变；违背 D．遭受。句意：最近的研究表明，大多数美国毕业生收到现金作为礼物，尽管数量人与人之间有所不同。故选C。