下图中滤纸Ⅰ上浸有饱和食盐水和酚酞，滤纸Ⅱ上浸有KMnO4溶液，接通电源一段时间后，发现a点附近变红，则下列说法中正确的是
A．a点和电源正极相连
B．发生还原反应
C．c点附近pH减小
D．d点附近颜色加深
答案：D
题目分析：A项：H+不断得到电子变成H2，结果在阴极区溶液里OH-的浓度相对地增大，使酚酞试液变红，a点连接的是阴极，故错。B项：b点连接的是阳极，发生的是氧化反应，故错。C项：c点附近pH增大，故错。故选D。
点评：本题考查的是电解原理，电解池：连接电池正极的碳棒电势较高，是正极，同时此电极发生氧化反应，是阳极，所以该电极既是正极又是阳极；连接电池负极的碳棒电势较低，是负极，同时此电极发生还原反应，是阴极，所以该电极既是负极又是阴极。
第三部分任务型阅读（共两节，满分35分） The history of Chinese calligraphy is probably as long as that of China itself. Calligraphy is a special category in China’s world of fine arts. Through the centuries Chinese characters have changed constantly and are mainly divided into five categories today: the seal script (zhuan shu), official script (li shu), regular script (kai shu), running script (xing shu) and cursive script (cao shu). Calligraphy involves a great deal of theory and requires many skills. Among the most outstanding calligraphers in ancient China were Wang Xizhi, Ouyang Xun, Yan Zhengqing, and Liu Gongquan, who are known for pioneering their own styles. In writhing calligraphy, one will need a brush, paper, an ink-stick and an ink-stone, commonly referred to as the “Four Treasures of the Study”. There are different types of brushes. White-goat-hair, black-rabbit-hair and yellow-weasel-hair brushes are the main ones. According to their function, brushes are classified into three groups: hard, soft and medium. Brush sticks are usually made of bamboo, wood, or porcelain; ivory or jade sticks are rare and precious. The ink-stick is a unique pigment used for Chinese traditional painting and calligraphy. The most famous ink-stick is hui mo (Anhui ink stick), made from pines that grow on Huangshan Mountain in Anhui Province. Clean water is needed to grind the ink-stick. Press the ink-stick hard and rub it lightly, slowly and evenly against the ink slab to make thick, liquid-ink. While paper comes in many varieties, Xuan paper, produced in Xuanzhou (today’s Anhui Province), is considered the best for Chinese calligraphy. The paper is soft and fine textured, suitable for conveying the artistic expression of both Chinese calligraphy and painting. With a good tensile strength and moth-proof quality, the paper can be preserved for a long time. Ink-stones or ink-slabs have been classified into three categories: Duan, she and Tao. Features common to all three are hardness and fineness. Although the stone is hard and fine, it is not dry or slippery. Using a hard and smooth stone, liquid ink can be produced easily by rubbing the ink-stick against the stone. By handling the brush and ink skillfully and carefully, the artist can produce an infinite variety of calligraphic styles and forms. Title: Chinese Calligraphy
| |||||||||||||||||||||||||||||||