完形填空（共10小题；每小题2分，满分20分）
阅读下面短文，掌握其大意；然后从21-30各题所给的A、B、C和D选项中，选出最佳选项，并在答题卡上将该项涂黑。
One factor that can influence consumers is their mood(情绪) state. Mood may be described ____21____ a temporary and mild positive or negative feeling that is generalized and not tied to any particular circumstance. Moods should be ____22____ from feelings which are usually much more stronger ____23____ to specific circumstances, and often conscious. In one sense, the effect of a consumer’s mood can be thought of in ____24____ the same way as our reactions to the ____25____ of our friends — when our friends are happy and “up”, that tends to influence us positively, but when they are “down”, that can have a negative impact on us. ____26____, consumers operating under a given mood state tend to react to stimuli(刺激因素) in a direction consistent with that mood state. Thus, for example, we should expect to see consumers in a positive mood state evaluate products in more of a ____27____ manner than they would when not in such a state. Moreover, mood states appear able to enhance(增强) a consumer’s memory.
Moods appear to be readily influenced by marketing ____28____. For example, the rhythm(节奏), pitch, and volume of music has been shown to influence behavior such as ____29____ of time spent in supermarkets or intention to purchase products. In addition, advertising can influence consumer’s moods which, in ____30____, are more likely to influence consumers’ reactions to products.
21. A. as           B. about           C. by                D. with
22. A. developed   B. discouraged                 C. divided    D. distinguished
23. A. related          B. referred             C. attached                 D. associated
24. A. nearly            B. much            C. even              D. still
25. A. signal            B. gesture           C. view              D. behavior
26. A. Similarly         B. However               C. Therefore        D. Besides
27. A. casual           B. confident               C. serious           D. favorable
28. A. tendency         B. techniques     C. temperature     D. operation
29. A. degree           B. amount                C. number           D. range
30. A. turn             B. total                     C. detail              D. depth