蝶腭动脉()
腭降动脉()
眶下动脉()
下牙槽动脉()
脑膜中动脉()

A．穿过棘孔的动脉分支是

B．穿过下颌孔的动脉分支是

C．穿过眶下孔的动脉分支是

D．穿过切牙孔的动脉分支是

E．穿过蝶腭孔的动脉分支是

The technological advances of the twentieth century have been brought about         an alarming reduction of our natural resources.

A．for the price of

B．in favor of

C．in place of

D．at the expense of