▶ Your Answer :
Although the author of the reading
passage argues that there are serious problems to accomplish travelling to
Mars, the speaker brings up several points to contradict this argument.
Firstly, the speaker maintains that
hydroponics can be a good solution for the long period of trip. Through
hydroponics, plants can be grown in the water, which takes small amount of
area. Additionally, wasted water can be recycled to cultivate the plants, and
the plants will change the carbon dioxide and poisonous gas into oxygen. This
contradicts the author’s claim that too much space for the basic living
sustenance will be needed for the long voyage to Mars.
Secondly, the lecturer argues that the
astronauts already have enough experience to adapt zero gravity. By exercising
regularly and taking enough vitamin and mineral, they can maintain their muscle
mass and bone density. This refutes the writer’s assertion that a zero-gravity
environment will have negative effects on astronauts’ health.
The final point made by the lecturer
is that the particles from the sun is dangerous only when they come out from
the sun, which is an extremely rare case. By installing special equipment, the
harmful particles can be detected, and astronauts can flee to a small and
lightweight shield to protect themselves. This goes against the author’s view
that the particles from the sun will threaten astronauts.
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