心电图检查对下列哪种疾病具有决定性诊断意义？

A．房、室肥大

B．电解质紊乱和药物中毒

C．心肌缺血和心肌损伤

D．心包疾病和心肌疾病

E．心律失常和急性心肌梗塞

Tired, Jim was fast asleep with his back _____ a big tree. [ ]

A. in

B. below

C. beside

D. against