举一反三
- Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another planet. A: have been B: are C: had been D: were
- 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.
- Whether or not there is life in outer space is an enigma. We may never know for sure until we are capable of space travel or aliens actually land on our planet. What would we call something to which we have no answer? Enigma means () . A: reason B: certainty C: mystery
- The ( )of outer space is one of the greatest triumphs of modern science.
- Outer space ________________(not explore) by people 50 years ago.
内容
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An astronaut cannot stay still in outer space, but instead___back and forth.
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The spaceship (____________) slowly (_________) the clouds and (_________________) of (__________) forest. The two astronauts (________) their space suits, (________) the door, (________) carefully (_______) the ladder, and (_____________) the planet.
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What<br/>are space agencies and companies aiming to do at present?() A: Recycle used space vehicles before they turn into debris. B: Develop technology to address the space debris problem. C: Limit the amount of debris entering space. D: Cooperate closely to retrieve space debris.
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中国大学MOOC: In 2013 Shenzhou-10 was launched successfully, _____________ building the Chinese Space Station.
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Astronauts were ordered to abandon the International Space Station because _______. A: they faced a threat from space junk B: an emergency was taking place back at Mission Control C: a lot of space junk had surrounded the Space Station D: they were being given an escape drill