问题
选择题
____ red is a symbol of warmth, it can sometimes make people feel uneasy or even frightened.[ ]
A. As
B. Since
C. If
D. While
答案
答案：D
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____ red is a symbol of warmth, it can sometimes make people feel uneasy or even frightened.[ ]
A. As
B. Since
C. If
D. While
答案：D