人在寒冷环境中增扭产热量的主要方式是
A．战栗产热
B．非战栗产热
C．温度刺激性肌紧张
D．肝脏代谢增强
E．内脏代谢增强
参考答案：A
His uncle _____ for more than 9 years.[ ]
A. has come here
B. has started to work
C. has lived there
D. has left the university
乡村集镇执行的环境噪声昼夜标准值分别是（）。
A.65dB，55dB
B.55dB，45dB
C.50dB，40dB
D.60dB，50dB
