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【单选题】
Brightness changes for different stars. Some give off a lot of light, but others are difficult to see from Earth.
A.
Brightness is how much light something gives off.
B.
Brightness is how big something is.
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参考解析：
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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.
【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.
【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.