Usually a meteorological observatory (气象台) _____ air quality in urban areas from one to five: excellent, fairly good, slightly polluted, poor, and dangerous.
| A．identifies | B．purifies | C．classifies | D．clarifies |
相关试题
--- The floor is dirty. Can anyone clean it?
--- ______. I do it all the time.
| A．Don’t mention it | B．Why you? | C．Not sure. | D．Not me again. |
In the face of ____
__ failure, it is the most important to keep up _____ good state of mind.
| A．/ ; a | B．a; / | C．the; / | D．/; the |
Tom hurried to school only to find that there was none because it was Sunday and he _____to school.
| A．couldn’t have gone | B．needn’t have gone | C．mustn’t go | D．needn’t go |
There is little time left, so the chairman asked me to _____my speech to 20 minutes.
| A．make | B．give | C．limit | D．explain |
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