The meaning for preheat is <span>heat beforehand.
Your answer is <em>heat beforehand </em>
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The correct answer is letter <span>A. dedicated. </span><span>The question talks about the Unit 7 of Lesson 12
Unit Checkpoint: Life Stories, Part 1. It describes the scientists as </span>dedicated. Scientists are mostly dedicated to the things that they are doing because whatever the output of their experiments are later be used.
An abandoned office would most likely be the best one. Just by hearing the word abandoned, it can give people chills because they don't expect what that abandoned office have. In a fiction story, it might have zombies or something.
It is a metaphore of speech
