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531 . বিশ্ব জনসংখ্যা বৃদ্ধির পর্যায়—

  • A. ৩টি প্রাথমিক, মাধ্যমিক ও সাম্প্রতিক পর্যায়
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537 . আইলা অর্থ— 

  • A. ডলফিন বা শুশুক
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538 . ঘূর্ণিঝড় আম্পান শব্দের অর্থ—

  • A. থাই ভাষায় অর্থ স্বাধীন চিত্ত, শক্তি ও দৃঢ়তা
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