治疗蝶窦恶性肿瘤的方法是（）。
A.首选手术治疗
B.以放射治疗为主
C.以手术治疗为主
D.首选化学治疗
E.以上方法均不是
参考答案：B
________, they had no chance of winning the war. [ ]
A. As they fought bravely
B. Bravely as they fought
C. As bravely they fought
D. They fought so bravely
化学与生活密切相关，生活中常见的现象属于化学变化的是
A．蜡烛燃烧
B．冰雪融化
C．香水挥发
D．干冰升华
