磷酸燃料电池是目前较为成熟的燃料电池，其基本组成和反应原理如下：
下列说法不正确的是
A．在改质器中主要发生的反应为CxHy＋xH2O xCO＋(x＋ )H2 |
B．移位反应器中发生的反应为：CO(g)＋H2O(g) CO2(g)＋H2(g) ΔH＞0，温度越高，CO转化速率越大 |
| C．负极排出的气体主要是CO2 |
| D．该电池正极的电极反应为O2＋4H＋＋4e－＝2H2O |
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 |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |