Scientists cannot _______ the existence of life on other planets.
举一反三
- What kind of planet elsewhere in the universe can support life A: Those double stars' planets. B: Those planets much hotter than our earth. C: Those planets similar to the earth. D: Those planets very close to their suns.
- 中国大学MOOC:"It’s unlikely there will ever be any ________ to the argument about whether there is life on other planets.";
- Though challenged by many people, Aczel firmly believes that ______. A: about 1 million planets in our galaxy are suitable for life B: it is very likely for life to exist on other planets C: life exists in approximately 150 billion stars in our galaxy D: there are a very large number of planets suitable for life
- Are there any ______for believing that there is life on other planets A: facts B: bases C: grounds D: foundations
- It is hoped that man will someday inhabit other planets.