ItwasDr.Rontgenwho（）X-rays.
A: discovered
B: invented
C: madeup
A: discovered
B: invented
C: madeup
举一反三
- It was Dr. Rontgen who （） X-rays. A: discovered B: invented C: made u
- James Watt （）the steam engine in 1796. A: discovered B: had discovered C: invented D: had invented
- In 1895, scientist ( ) discovered X-rays. A: Descartes B: Madame Curie C: Roentgen D: Marco Polo
- The completely new method was _______ by Jack. A: discovered B: invented C: created D: produced
- It is well known that Tomas Edison ______ the electric lamp. A: discovered B: developed C: found D: invented