脑膜脑炎的病因不包括（）
A.细菌感染
B.病毒感染
C.脑部损伤
D.寄生虫侵袭
E.维生素D缺乏
参考答案：E
The old farmer______ farm we spent a happy weekend was spellbound by Chinese culture.
A．on whom
B．who
C．on whose
D．whose
用1000t含氧化铁80%的赤铁矿石，理论上可以炼出含铁96%的生铁的质量是多少？
