下列句子的标点符号使用有误的一项是（    ）

下列实验的现象和所得结论均正确的是（   ）

选项	实验	现象	由现象所得结论
A	将Cl2通入品红溶液	品红褪色	Cl2具有漂白性
B	向白色AgCl悬浊液中滴加0.1mol/LKI溶液	试管中白色沉淀转化为黄色沉淀．	Ksp（AgCl）＞Ksp（AgI）
C	将CO2通入CaCl2溶液中	无明显现象	非金属性：Cl＞C
D	用坩埚钳夹住一小块用砂纸仔细打磨过的铝箔在酒精灯上加热	熔化后的液态铝滴落下来	金属铝的熔点较低

阅读短文，完成句子。
    Lychees grow in the south (南方) of China. They are small with red peel (果皮). Most people like to eat them, because they are sweet and full (充满的) of juice.  There is an old story about lychees. Yang Yuhuan loved lychees very much. Lychees have a lot of vitamin C. It is very important for people. Vitamin C can make children more healthy. So many parents often buy lychees for their children. Amy and her mum are in the fruit shop now. What fruit are they going to buy? Look! They are buying lychees
从文章中找到适当的单词或短语填空，完成句子。

下列计算中，正确的是

下图示意在降雨强度与坡度均相同条件下，五种不同初始干密度(g/cm³)土壤模型，坡面径流的平均流速随时间的变化。干密度与孔隙率呈负相关。据此完成下列各题。