Mars

贡献者:devzhk 类别:英文 时间:2019-10-11 14:35:32 收藏数:8 评分:1
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Both reading and listening are arguing over the question that whether sending humans to Mars is
possible. More specifically, in regards to the reading passage, the writer put forth the idea that
sending humans to Mars is impossible because of three unsolved challenges. In the listening passage,
the lecturer rebuts the statement, and believe that it is possible, and address, in detail, the
trouble with each point made in the reading text.
First and foremost, the author of the reading states that it is impossible to bring enough food,
water and oxygen for a two-year trip to Mars and back. The lecturer, however, says this is not a
real problem since the astronauts could use hydroponics to grow crop plants in water and food will
not be an obstacle. Also, they could grow plants with recycle waste water and reuse it as clean
water vapor, which could be drunk. Plus, since all plants do photosynthesis, the astronauts could
breathe fresh air released by them.
Secondly, the writer demonstrates that living in a zero-gravity environment for two years would
exert a negative effect on one's health. Nevertheless, the lecturer illustrates that the astronauts
have learned to use several techniques to make up for the health issue. They will do regular
exercise to prevent muscle mass from decreasing and take vitamins and minerals problems with their
bone density. This is the second explicit point where the lecturer challenge the reading.
The reading then indicates that solar radiation would be dangerous to astronauts and it is
impossible to build a shield for the ship. Not surprisingly, the lecturer takes issue with this
claim by contending that the spaceship could be equipped with a special instrument to monitor the
radiation. What's more, the device could also shield against the radiation. When the astronauts
meet the period of a large amount of radiation, they could hide inside the shield area and come out
when the danger has passed.
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