题目内容

蛋白质吸收的形式是

A. 氨基酸
B. 葡萄糖
C. 胨
D. 果糖
E. 眎

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脂肪吸收的途径是

A. 血液
B. 淋巴
C. 组织液
D. 脑脊液
E. 以上都不对

Mammals breathe with ____.

A. lungs
B. gills(鳃)
C. wings
D. eggs

The process that takes place as a tadpole (蝌蚪) changes into a frog is ____.

A. digestion (消化)
B. metamorphosis (变形)
C. photosynthesis (光合作用)
D. protection

____ is the only mammal capable of true flight.

A. The bald eagle
B. The flying squirrel
C. The bat
D. The penguin

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