某同学按如下图所示的装置进行实验。A、B为两种中学常见金属，它们的硫酸盐可溶于水，当S闭合时，在交换膜处SO从右向左移动。下列说法错误的是（ ）
A．电解一段时间后，向Ⅱ装置通入适量的HCl气体可以恢复原来的浓度
B．反应初期，Y电极周围出现白色沉淀
C．B电极质量增加
D．X电极产生气泡，且生成1mol气体的同时，有1molA参与反应
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
The CDs are on sale! Buy one and you get ______ completely free. 
| A． | other | B． | others | C． | one | D． | ones |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |