Q:19.What was the Beecher sisters' idea of a kitchen?
A place where women could work more efficiently.
B. A place where high technology could be applied.
C. A place of interest to the educated people.
D. A place to experiment with new ideas.
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Q:20.What do we learn about today's kitchen?
A. It represents the rapid technological advance in people's daily life.
B. Many of its central features are no different from those of the 1920s.
C. It has been transformed beyond recognition.
D. Many of its functions have changed greatly.
下列不属于辅助呼吸器官的是_______.
A. 皮肤
B. 口咽腔
C. 鳃上器官
D. 鳔
外胚层内凹,内胚层向外伸展,形成了------.
A. 鳃
B. 鳞片
C. 鳃小片
D. 鳍
一般鱼类的鳃片是______发生的.
A. 外胚层
B. 中胚层
C. 内胚层
D. 生发层
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