How long did it take for the world's population to increase from 2 billion to 3 billion
A: 304 years.
B: 123 years.
C: 33 years.
D: 14 years.
A: 304 years.
B: 123 years.
C: 33 years.
D: 14 years.
举一反三
- When did life begin? A: 13.8 billion years ago. B: Between 13.8 and 10 billion years. C: Between 10 and 4.5 billion years. D: Between 4.5 and 3.5 billion years.
- Tracy is _______ years. A: 28 years old. B: 24 years old. C: 33 years old.
- How many years have the woman been working in A: Two years. B: Three years. C: Five years. D: Eight years.
- How many years had he lived in Beijing A: 20 years. B: 15 years. C: 10 years.
- A Representative of House’s term of office in the United States is two years, while a Senator’s is A: [A] two years. B: four years. C: six years. D: eights years.