连词成句。

1. there, a forest, the park, Is, in (?)

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2. there, Yes, is (, .)

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3. a, river, there, Is (?)

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4. No, isn't, there (, .) 

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患儿，先天性骶前肿块，近日突然增大，伴发热、红肿，破溃溢出毛发及皮脂，血清甲胎蛋白增高，B超为实质肿块，X线片无钙化影。考虑诊断为（）

A.横纹肌肉瘤

B.淋巴管瘤继发感染

C.先天性潜毛窦

D.未成熟畸胎瘤

E.肛周脓肿