题目内容
The researchers identified short _____ of DNA that show up only in a specific species.
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I’m all in favor of those things that keep us looking and feeling our youthful best, including _____ amounts of plastic surgery.
Scientists immediately scrambled to find an explanation that could _____ a persistent, recurring cycle of planet-wide species die-outs.
The patient’s ability to enjoy good health thereafter depends on his _____ in following his treatment program.
I remember cold metal instruments checking my _____, taking my temperature.
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