患者，男性，45岁，近半年来右下后牙遇冷水及吃甜食酸痛，咬硬物酸软无力，无自发痛。检查时可见面釉质中度磨损，牙本质外露，探针划某点感觉异常酸痛。

可能是磨损并发症的是（）

A.食物嵌塞

B.牙髓病

C.颞下颌关节紊乱病

D.创伤

E.创伤性溃疡

F.根尖周病

Many trees and flowers ________ in our city every year. [ ]

A. planted

B. are planted

C. were planted

D. plants