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B ইউনিট || কুমিল্লা বিশ্ববিদ্যালয় || 2008

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from prehistoric time
Since the invention of valves
Only in the last fifty years
since the nineteenth century
his lungs
part of the stomach
a major organ such as the stomach or one lung
his brain
removing the blood vessels
having a bypass surgery
getting rid of the blockage
replacing with new vessels
understandable
logical
unreasonable
unusual