下列反应中，属于取代反应的是\(\rm{(}\)　　\(\rm{)}\)
\(\rm{①C_{6}H_{6}+HNO_{3} \xrightarrow[\triangle ]{{浓}H_{2}SO_{4}}C_{6}H_{5}NO_{2}+H_{2}O}\)             
\(\rm{②CH_{3}CH_{2}OH}\) \(\rm{ \xrightarrow[\triangle ]{{浓}H_{2}SO_{4}}CH_{2}=CH_{2}+H_{2}O}\)
\(\rm{③CH_{3}COOH+CH_{3}CH_{2}OH \xrightarrow[\triangle ]{{浓}H_{2}SO_{4}}CH_{3}COOCH_{2}CH_{3}+H_{2}O}\) 
\(\rm{④CH_{3}CH=CH_{2}+Br_{2} \overset{CCl_{4}}{ \rightarrow}CH_{3}CHBrCH_{2}Br}\)．