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Some high-pitched sounds are inaudible to the human ear.Inaudible means（）
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Because of the stress in society, the type of food people eat, obesity, and the lack of exercise, cardiologists are concerned about the increase in myocardial infarctions.Cardiologists study（）
The characteristics of mRNA are（）
The high-level structure of eukaryotic DNA includes（）
What happens after double-stranded DNA is heat denatured（）
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