Darwin's most important book On the Origin of Species was the result of many years of research.
举一反三
- Monetary _____ is the most important factor in encouraging citizens’ blood donation in many countries. </p></p>
- When results of a research appear in a paper in combination with ______, the author could point out the limitations of this research and recommend further research. </p></p>
- Good research questions are important in research.
- <p>The most important element of a song is __________.</p>
- Which one is NOT the important procedure to choosing a research topic? </p></p>