شرکت در آزمون آنلاین
زبان انگلیسی 1
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زبان انگلیسی 1
| آزمون شماره 12941
Which sentence is NOT correct?
In all societies, the poor are found at the bottom of the social …; on the contrary, the rich remain at the top of it.
The scientists did an/a ... on rats to see if the new medicine is safe for people or not.
