题目内容

The liver is a tubular organ.()

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Metaplasia epithelium distributed in()

A. ureter
B. trachea
C. intestines
D. bladder

The esophagus is a substantial organ.()

The following organs are substantial organs()

A. liver
B. lungs
C. ovary
D. spleen

The basic unit of organism structure and function is()

A. cell
B. tissue
C. organ
D. system

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