某植物提取物遇皮肤呈蓝色，可能含有
A．蒽醌B．鞣质C．环烯醚萜D．生物碱E．强心苷
参考答案：C
解析：环烯醚萜遇氨基酸产生蓝色沉淀。
读一读，判断对(T)错(F)。
Li Ming and Jenny are very thirsty. They go to a shop to buy something to drink. Li Ming would like a
bottle of pop. Jenny wants to have some orange. Li Ming also tasts a sandwich and some of his favourite
food for lunch.
( ) 1. Li Ming and Jenny are very hungry.
( ) 2. Jenny wants to have some pop to drink.
( ) 3. Li Ming only buys some pop.
( ) 4. Jenny wants to have some orange.
( ) 5. Li Ming and Jenny go to a shop in the evening.
在光的反射现象中．当入射角增大时．反射光线就向______（选填“靠近”或“远离”）法线的方向移动．若将入射光线改为逆着反射光线的方向射去，则此时反射光线将逆着原来的入射光线的方向反射，这表明在光的反射现象中，光路是______的．
