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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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【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】The sun is the closest star to Earth. Its ( ) gives Earth light.
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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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【单选题】What was her big discovery?
A.
the size of stars
B.
the brightness of stars
C.
the number of stars
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