在铁和铜的混合物中加入一定量的稀硝酸，充分反应后剩余金属的质量为m1g，再向其中加入一定量的稀硫酸，充分振荡后，剩余金属的质量为m2g，则m1与m2的关系是
| A．m1>m2 | B．m1≤m2 | C．m1≥m2 | D．m1= m2 |
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 |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |