quEstions 11 to 13 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 15 sEConDs to AnswEr thE quEstions.
now, listEn to thE pAssAgE.
whAt DoEs thE pAssAgE mAinly DisCussA．how CAnAls ArE ConstruCtED、
B．Common typEs oF CAnAl BoAts AnD BArgEs.
C、thE worlD’s lArgEst CAnAls.
D．how CAnAls ArE usED AnD ClAssiFiED、