下列离子方程式书写正确的是（ ）
A．碳酸氢镁溶液加入过量氢氧化钠： |
B．碳酸钡溶于醋酸溶液： |
C．次氯酸钙溶液中通入少量二氧化碳： |
D．氧化铁加入氢碘酸中： |
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
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 ks |
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 |