شرکت در آزمون آنلاین
انگلیسی 3
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درس دوم
| آزمون شماره 6761
Hearing ……… is the third most common health problem in the United States, and it can affect the quality of your life and relationships.
Microbes are ............................. to the human eye . But when they are magnified by a microscope, we can see them.
