翅脉
参考答案：
翅由上下两层膜质紧密接合而成一平面状，有体液进入，有气管及神经分布其中，因而保留着中空的脉纹，称为翅脉。
Recently, I bought a new apartment(公寓), _______ was high.
A．which price
B．the price of which
C．its price
D．the price of whose
The square root of 800 is between which of the following integers ？（）
A. 21 and 25
B. 24 and 28
C. 27 and 31
D. 30 and 34
E. 33 and 37
