তাং- ১৪/১০/২০২০,বুধবারে। ৩য় শ্রেণি বিজ্ঞান। ১১ অধ্যায় ” তথ্য ও যোগাযোগ ” শামীম আহমেদ। ৩য় শ্রেণি,বিজ্ঞান, রিভিশন ক্লাস,১১অধ্যায়,জনসংখ্যা ও প্রাকৃতিক পরিবেশ। শামীম আহমেদ।

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