金属与石材幕墙板面嵌缝应采用（）。
A．中性硅酮耐候密封胶
B．中性硅酮结构密封胶
C．酸性硅酮耐候密封胶
D．酸性硅酮结构密封胶
参考答案：A
______ with the size of the whole earth, the biggest ocean does not seem big at all. [ ]
A. Compare
B. When compared
C. Comparing
D. When comparing
