助色基团
参考答案：
能使吸收波长向长波方向移动的杂原子团（如：-COOH，-OH，-NH2，-CL）。
烹调蔬菜时损失较多的营养素为（）
A.蛋白质
B.脂肪
C.碳水化合物
D.β-胡萝卜素
E.抗坏血酸
Three-fourths of the buildings _____ in the earthquake. [ ]
A. was destroyed
B. is destroyed
C. were destroyed
D. have destroyed
