2023 영천고 1학년 Lesson 7.

task, duties, assignment, chore

• atmosphere

• plan

• mission

• nitrogen

to move or turn in a circle

• rotate

• split

• prove

the natural force that tends to cause physical things to move towards each other; the force that causes things to fall towards the Earth

• inertia

• gravity

• acceleration

• elasticity

For years, scientists have been curious about Mars, the "Red Planet." and ______ or not humans would be able to live there.

• if

• whether

Recent research has proved ______ there is water on the planet.

• which

• that

• what

Mars rotates at almost exactly the same speed as Earth, ________(make) its days 37 minutes longer than our own.

The Martial year is far ___(A)___, lasting 687 Earth days. That means seasons on Mars are about twice as ___(B)___ as they are on Earth.

• longer --- long

• shorter --- short

• long --- shorter

• short --- longer

The air on Earth is about 21% oxygen and 78% nitrogen, but the atmosphere on Mars _________ of 96% carbon dioxide and less than 0.2% oxygen.

• consists

• is consisted

According to scientists at NASA, on Mars ________________ there is still water on the polar ice caps.

(highly / it / likely / is)

The water could be used to ___(A)___ oxygen by ___(B)___ up the hydrogen and oxygen atoms.

• produce --- split

• produce --- splitting

• produced --- split

• produced --- splitting