与水不发生燃烧反应的化合物为（）。
A、钠
B、钾
C、浓硫酸
D、锌粉
参考答案：C
—Why did you say that the journalist is very aggressive?
—To be ________, he tries every means to ask questions of those VIPs. [ ]
A. exact
B. honest
C. practical
D. sure
“释放”的专用手势信号是：两小臂分别置于侧前方，手心朝（），两臂分别向两侧摆动。
A、外
B、内
