题目

完形填空    阅读下面短文，掌握其大意，然后从各题所给的 A, B, C，D 项中选出最佳选项。 Li Yong likes swimming very much. Last summer he and his parents went to Qingdao to spend their __1__. The first morning they had a quick meal and went to the sea. They went swimming and ___2___ themselves in the sea for __3__ two hours. When they came back to the beach and lay __4__, Li Yong said to his father,” I want something to eat.  I’m__5__ now.” Then they came into a __6__ near the beach. His father told the young ___7___ to bring a bottle of orange, 用惰性电极电解CuSO4溶液，当电路中通过0.4mol电子时，阴阳两极产生相同体积的气体，若电解后溶液的体积为2L，则电解后溶液的pH为（    ） 电解   电解       A．7             B．2           C．1.3             D．1