Language study is a process that you need to _____ something
| Language study is a process that you need to _____ something first and later on you can take something out. |
| [ ] |
| A. put in B. put down C. put away D. put through |
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化学反应往往需要在一定条件下进行．通过控制或改变反应条件，可以加快、减缓甚至阻止反应的进行．如图所反映的措施中，能加快其化学反应速率的是( )
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