I flew into Basra, Iraq’s largest port. The city straddles the Shatt al-Arab river, which is formed by the confluence of the Tigrisand Euphrates. The two mighty __53__ inspired the name Mesopotamia. It was from Basra __54__ the fictional mariner Sinbadthe Sailor set out on his voyages to supernatural realms in Arabian Nights. __55__ , the start of my own journey was far moremundane. The desert eventually turned to green as we __56__ the highway and entered the vast wetlands. These southern Iraqimarshes are one of the world's largest inland delta systems.
【題組】53.
(A) batteries
(B) cannons
(C) membranes
(D) waterways