The universe is estimated ___between 10 billion and 20 billion years old.
A: being
B: to be
C: which is
D: is.
A: being
B: to be
C: which is
D: is.
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.
- Conversation One When did the “big bang” occur A: No one knows. B: 12 billion years ago. C: 20 billion years ago.
- The economic ___ caused in the snowstorm increased ____20 billion yuan, which meansreaching 20 billion yuan.[1分]
- 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
- It is estimated that by 2050, there could be . A: more than 6 billion people B: no more than 6billion people C: up to 9 billion people D: over 9 billion people