In 1895, scientist ( ) discovered X-rays.
A: Descartes
B: Madame Curie
C: Roentgen
D: Marco Polo
A: Descartes
B: Madame Curie
C: Roentgen
D: Marco Polo
举一反三
- Madame Curie is believed ____ the radium. A: discovering B: having<br/>discovered C: to have discovered D: to discovered
- Madame Curie is believed _________ radium (镭). A: discovering B: having discovered C: to have discovered D: to discover
- Madame Curie is often _____ as an example of a great scientist who would never yielded to hardships in her quest for knowledge.
- Marco Polo wrote his book The Travels of Marco Polo while he was travelling in China.
- Madame Curie is believed radium.