شرکت در آزمون آنلاین زبان انگلیسی 1 - درس 3 | آزمون شماره 1410
1- A lot of doctors are ……… on “AIDS” and are trying to find a way to control it.
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Tom's professor explained the difference between science and .................... , the first one is what researchers are currently working on and the second one is what human has already found out about the world.
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