根据汉语提示完成下列句子。

①His illness_________（由于）eating contaminated food.  

②The accident_________（导致）the death of two passengers.  

③The machine is_________（成果）of his studies. 

④It doesn't often rain in summer here._______（因此） we have to water the vegetable garden.  

⑤____________（由于下雨），he was late for school.

男，5岁，肘部外伤，用哪种体征来鉴别肱骨髁上骨折和肘关节脱位最可靠（）

A.肿胀明显

B.肘关节活动明显受限

C.疼痛

D.畸形

E.肘后三角关系有无改变