Is the space travel to other planets safe?
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举一反三
- While space travel
- 学起: Space travel is dangerous and the astronauts in space have to ______ many discomforts (不适) in their rockets.
- The passage is mainly about ______. A: the development of space' technology B: the obstacles and prospects of space transportation C: the public interests in space travel D: the growth of space business
- Are there any ______for believing that there is life on other planets A: facts B: bases C: grounds D: foundations
- According to Newton's principle ______. A: the force of gravity keeps planets orbiting around the sun rather than flying off B: the sun is the most massive object, making up 99.8 percent of the mass of the solar system C: the amount of mass determine how fast the objects travel as they orbit each other D: Pluto receives the least force of gravity from the sun of all the planets in the solar system
内容
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The economic impact is little when travel for health, compared to other types of travel, like recreational travel, cultural travel.
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What does the woman think of the man’s space travel plan?
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Why is the journey to the outer space not a dream any more? A: Because people can go anywhere now. B: Because people can travel to the outer space by airplane now. C: Because the modern means of transportation makes the journey smoother. D: Because people can travel to the outer space by rockets and space shuttles.
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Travel in space can be very exciting; ________, it can also be boring and lonely at times.
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5. Space travel became technologically________ in the twentieth century. A: feasible B: feasable