____ red is a symbol of warmth, it can sometimes make people feel uneasy or even frightened.
A．AsB．SinceC．IfD．While
D
考查連詞。句子前后表讓步關(guān)系，排除B,C；as引導(dǎo)讓步狀語從句時，句子要進(jìn)行倒裝，而原句是正常語序，排除A；所以選D，While雖然，盡管，表讓步。
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