Title: वैकल्पिक

Text: During the whole lecture Mendeleev taught us how to observe phenomena of everyday life and how to understand them: He imparted on his pupils his skill in observing and thinking, which no one book can give. प्रत्येक पराग्राफले परीक्षण हुनेछ।

Save test: यदि तपाईं यो टाइपिङ परीक्षणलाई साझा गर्न चाहानुहुन्छ भने यो प्रयोग गर्नुहोस् (केवल प्रमाणीकृत प्रयोगकर्ताहरूको लागि)।