下列不属于与家鸽飞行生活相适应的外形特点的是 [ ]
A．前肢变为翼
B．全身被羽毛
C．身体呈流线型
D．体温恒定，适应能力强
答案：D
Thanks to the Internet, large quantities of information are now _____ to us in our home.
A．incredible
B．reasonable
C．valuable
D．accessible
电机车供电电压采用交流电源应不超过500v。
