过敏性休克,治疗应首选的药物是下列哪一项()。
A.肾上腺素
B.糖皮质激素
C.抑肽酶
D.多巴胺
E.维生素C
参考答案:A
The No. 6 Middle School is not far _ __ his home. [ ]
A. to
B. from
C. with
D. at
提高炉子热效率有哪些途径?