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What's the main idea of paragraph 4 (starting line 36)?

In line 72, what does it refer to?

Reading comprehension

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Answers

1
In line 72, what does it refer to?
transporting supplies to ISS
sending several unmanned spacecraft to Mars
making a self-sustaining civilization on Mars
putting a few astronauts on Mars
2
What's the main idea of paragraph 4 (starting line 36)?
Making money has always encouraged exploration.
The dev. of space travel has been slow for economic reasons.
The search for knowledge should drive space exploration.
It'll take more resources to convince people to go to space.
3
When was the U.S. least active in space exploration?
the early 70s to mid-70s
the early 60s to mid-60s
the late 70s to early 80s
the late 80s
4
Which statement about space exploration is NOT true?
There's new interest in manned & unmanned missions to space.
More private companies are beginning to explore space.
Humans have recently traveled more than 650 km from Earth.
In 2012, a company sent an unnamed rocket to the ISS.
5
What could the word energy be replaced with in line 33?
capacity
enthusiasm
fuel
investments
6
What does SpaceX want to do?
get the gov's approval to transport astronauts to the ISS
build a space station that can replace the ISS
partner w/Planetary Resources to mine asteroids for platinum
develop a reusable rocket that can take supplies to the ISS
7
What does one refer to in line 22?
one spacecraft
one reason
one asteroid
one metal