题目内容

These stomach exercises will tighten_________ muscles.

A. peristaltic
B. abdominal
C. renal
D. intravenous

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The liver and__________cannot be completely separated physiologically and pathologically.

A. gallbladder
B. kidney
C. spleen
D. lung

丁型肝炎病毒

戊型肝炎病毒

乙型肝炎病毒