题目内容

____ is the primary absorptive region of the small intestine.

A. jejunum
B. ileum
C. stomach
D. appendix

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Each tooth consists of pulp, surrounded by a hard substance called_ and a white smooth substance called __

A. enamel, cementum
B. gingivae, calcium
C. cementum, enamel
D. gums, enamel

Hanging from the soft palate is a small tissue called _____

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Stomach consists of _____, body and antrum.

A. pylorus
B. cardia
C. rugae
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After passing through the stomach, food then enter goes to ______

A. duodenum
B. spleen
C. ileum
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