2岁患儿，智力低下，体格发育迟缓，眼距宽，鼻梁低平，眼裂小，有内眦赘皮，外耳小，舌常伸出口外，头围小于正常，出牙延迟，四肢短，关节可过度弯曲，atd角增大。

下列哪项检查对明确诊断最有意义（）

A.尿三氯化铁试验

B.染色体检查

C.血清甲状腺素检测

D.尿蝶呤分析

E.酶学检测

A. substantial damage
B. as different
C. the terrorist attacks
D. the city’s economy
E. the rest of the nation
F. clearly avoidable
G. easily noticeable

The pain caused by the terrorist attack is ______.