下列关于硝酸钾施用方法叙述正确的是（）。
A.宜作追肥
B.适宜作浸种用
C.宜施于马铃薯、甘薯等喜钾作物上
D.以上均正确
参考答案：D
15.4478保留一位小数是______，保留两位小数是______．
—Would you like to climb mountains with me this Sunday?
—I’d love to. But I_______ play table tennis between Class Three and our class.
A．am going
B．am going to
C．am
D．going to
