Some scientists think there may have been life on the Mars in the past because （）
A: there is no life there now
B: there is a large amount of water at the poles
C: the Mars may be able to support life in the future
D: conditions may have been similar to those on the Earth
A: there is no life there now
B: there is a large amount of water at the poles
C: the Mars may be able to support life in the future
D: conditions may have been similar to those on the Earth
举一反三
- Scientists think that there _____ life on Earth for millions of years. A: has had B: have had C: has been D: have been
- He was an early _______ of the theory that life on Earth may have come from Mars.
- If you had told me about your problem, I ____ able to help you. A: might be B: may have been C: may be D: might have been
- According to the author, many leading scientists ______. A: have acknowledged that only religion can explain the mystery of life B: have been puzzled by the mystery of life and material things C: have attempted to explain physical life from a religious point of view D: have been so intrigued as to make great efforts to solve the mystery of life
- As can be probably perceived, a manned trip to Mars may soon ________ since scientists have achieved the manned moon mission.