题目内容
Research continues as to whether _____ dieting is dangerous to cardiovascular health.
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Unfortunately this lack of _____ physical exercise has resulted in an increase of various illnesses.
The researchers identified short _____ of DNA that show up only in a specific species.
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.
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