早期食管癌的临床表现有哪些()
A．食管气管瘘
B．咽下食物哽噎感
C．胸骨后针刺样疼痛
D．声音嘶哑
E．食管内有异物
参考答案：B, C, E
读下图，俄罗斯有丰富的自然资源，图中主要矿产资源是（ ）
A．煤、铁、石油、天然气、森林
B．石油、铁、水能
C．黄金、金刚石、铝土
D．煤、铁、石油
— My sister is very upset today.
— It's your fault. You ______ the bad news to her yesterday. [ ]
A. should tell
B. should have told
C. shouldn't have told
D. must tell
