Question

read the passage. then answer the question. space flights although private companies have begun to take people into space for recreational purposes, space flight should only be used for scientific missions with experienced astronauts. astronauts are highly trained and well prepared for space missions, which can be dangerous. they also must be in excellent health; they are required to have medical screenings every year. this is not required for regular passengers, and some could become ill or injured on space flights. in addition, there are serious environmental concerns regarding recreational flights. it would be best to discourage them at this point. what is the main argument in this passage? a most astronauts are highly trained professionals. b recreational flights cause environmental damage. c passengers could become injured on space flights. d space flights should only use experienced astronauts.

Explanation:

The passage starts by stating that space flight should only be for scientific missions with experienced astronauts. Then it gives reasons like the danger of space - missions, the medical requirements of astronauts not being met by regular passengers, and environmental concerns of recreational flights. All these details support the main argument that space flights should only use experienced astronauts.

Answer:

D. Space flights should only use experienced astronauts.