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.
内容
- 0
What do we learn about the number of international students in China in 2017? A: It has increased a little than 10 years ago. B: It is as three times as 10 years ago. C: It is the same as 10 years ago . D: It has more than doubled during the past 10 years.
- 1
The first period usually begins _____________.( ) A: between10 and 16 years of age B: between 12 and15 years of age C: between 15 and 16 years of age D: between 10 and 12 years of age
- 2
How many years had he lived in Beijing A: 20 years. B: 15 years. C: 10 years.
- 3
It’s a(n) ________________ idea, but imagine getting into a spaceship and traveling back in time 4.5 billion years. A: squash B: preposterous C: infinite D: abrupt
- 4
The Milky Way began to form about 11.5 billion years earlier than Earth.