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玄参具有功效是 A. 清热凉血、祛瘀 B. 泻火解毒、透疹 C. 泻火解毒、滋阴 D. 清热解毒、利尿

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Directions: Please choose the best answer from the following 4 choices, and fill in the blank.
In the historic center of Beijing modern siheyuans have been constructed using the courtyard concept and ostensibly many of the ____of the traditional Beijing house, but using modern techniques.

A．features
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