用下列实验装置完成对应的实验(部分仪器已省略),能达到实验目的的是()
| |
A |
B |
C |
D |
| 装置 |
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| 实验 |
吸收NH3 |
干燥氯气 |
石油的分馏 |
制取乙酸乙酯 |
The CDs are on sale! Buy one and you get ______ completely free.
| A.other | B.others | C.one | D.ones ks |
Progress______ so far very good and we are sure that the work will be finished on time.
| A.was | B.had been | C.has been | D.will be |
Charles was alone at home, with_______ looking after him.
| A.someone | B.anyone | C.not one | D.no one |
It is often ______ that human beings are naturally equipped to speak.
| A.said | B.to say | C.saying | D.being said |
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 |