再作何检查动作（）
A.拇指背伸
B.拇指屈曲
C.前臂旋前
D.腕关节尺倾
E.腕关节桡偏
参考答案：D
His cousin likes baseball ______ volleyball. [ ]
A. but
B. or
C. and
D. of
火箭常用联氨（N2H4）作燃料，反应的化学方程式为：N2H4+2NO 点燃 . 2X+2H2O．则X的化学式是（ ）
A．N2
B．NO2
C．NH3
D．N2O
