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【单选题】

The universe is really big! It contains planets, stars, and moons.

A.
The universe is Earth, our moon, and the sun.
B.
The universe is everything that exists.
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【单选题】The distance between the cities of Dallas and Fort Worth is very small. You can drive from downtown Dallas to downtown Fort Worth in about 30 minutes.
A.
Dallas is far from Fort Worth.
B.
Dallas is near Fort Worth.
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【简答题】The Earth, sun, moon, and stars are only a few things in our ( ) .
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【单选题】Benjamin Franklin discovered important facts about electricity. He showed that lightning is electricity.
A.
He read about electricity and understood the facts.
B.
He found new information about electricity.
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【简答题】Andrew's job is to study the universe. He is an ( ) .
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【简答题】Astronomers have not ( ) if there is life outside of our universe.
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【简答题】The ( ) between the sun, the moon, and the stars is very great.
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【简答题】The sun is the closest star to Earth. Its ( ) gives Earth light.
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【简答题】Mika is a ( ) . She started college when she was only 14 years old! Now she is an astronomer.
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【简答题】The famous astronomer Edwin Hubble ( ) in 1953. He was 63 years old.
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【单选题】What kind of scientist was Henrietta Leavitt?
A.
biologist
B.
chemist
C.
astronomer
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