As early as his second film, Chaplin had developed his own manner of acting, the one that ________

world famous.   [      ]

A. would become

B. had become

C. was to become

D. became

(1)利用太阳能的方法之一，是将装有芒硝的密闭塑料管安装在房屋的外墙内，当太阳照射时，它能将太阳能转化为化学能，达到蓄热作用，使室内保持较低温度；晚上，它能将化学能转化为热能放出，使室内保持温暖。这种作用是利用了______反应(用化学方程式表示)。

(2)地球外层空间存在着微量的臭氧和氧原子。该臭氧能阻挡太阳的有害紫外线辐射。可是人为的大气污染会破坏臭氧层，如超音速飞机排放物含NO和NO2与O3及O2可发生：O3+NO=NO2+O2；O+NO2=NO+O2的反复循环反应，其总方程式为______，由此可见氮氧化物在破坏臭氧层过程中起到了_______作用。