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【单选题】
Which of the following description does not belong to the focus “being fashionable”?A.
She looked tall, fair, and shapely.
B.
On each of her temples her hair, of a very dark brown, was clustered in round curls, according to the fashion of those times, when neither smooth bands nor long ringlets were in vogue.
C.
Her dress, also in the mode of the day, was of purple cloth, relieved by a sort of Spanish trimming of black velvet.
D.
A gold watch (watches were not so common then as now) shone at the girdle.
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举一反三
【多选题】下列电对的电极电势值不受溶液酸度影响的是（）
A.
这是单选题
B.
MnO 4 － / MnO 4 2-
C.
MnO 4 － / Mn 2 ＋
D.
S / H 2 S
E.
O 2 / H 2 O
【简答题】溶液的酸碱度(酸碱性强弱的程度)常用pH来表示。江河湖泊水体的pH小于6.6或大于8.5时，就会使水生生物受到不良影响，严重时造成鱼虾绝迹。流溪河是广州市人民的重要饮水源，某校研究小组的同学在“我与化学”的活动中，对流经从化几个城镇的流溪河段水质pH值进行了测试。 1.取样。从上游到下游分别选择8个重要河段取样，并按次序分别编为1～8号。 2.测试及数据记录。用酸度计分别测定各河段水样的PH值，并...
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