Câu hỏi:
In order to figure out what is in a sealed box, you perform some tests. The box seems heavy for its size and is harder to remove from a steel table than when placed on a concrete floor. What kind of object could be inside the box?"
Đáp án:
The answer is magnet because it would be really hard to move a magnet across a steel table since it would attract to the steel-not making it able to move.
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