These flowers are pleasant to ______.

A．be looked at

B．look at

C．looking at

D．for looking at

扑救露天堆垛火灾时，应实施（）的战术措施，消灭火灾。

A.冷却防爆、强攻近战

B.冷却保护，攻防并举

C.分段合击、区域窒息

D.以阵地战为主