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.
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.
举一反三
- The universe is estimated ___between 10 billion and 20 billion years old. A: being B: to be C: which is D: is.
- Conversation One When did the “big bang” occur A: No one knows. B: 12 billion years ago. C: 20 billion years ago.
- According to the information given in Paragraph 5, we can conclude that the distance between the earth and the moon is approximately__________. A: 186,000 miles B: 372,000 miles C: 11 billion light years D: 2 billion light years
- 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.
- What does Bruce hope to achieve in the next few years（） A: to become a $ 5 billion company. B: to become a $ 6 billion company. C: to become a $ 8 billion company.