精确制导弹药自身无动力装置，弹道的初始段、中段需借助火炮、飞机投掷。可分为（）
A.弹道导弹
B.末制导弹药
C.末敏弹药
D.巡航导弹
参考答案：B, C
--- It’s more expensive to live in the city than to live in the country, I think.
--- ____ . Living in the city brings people better conditions, though.
A．That’s all right.
B．I’m sorry to hear that
C．That is really necessary
D．I couldn’t agree more.
鼻腔及鼻窦恶性肿瘤的最准确的诊断手段是（）。
A.磁共振成像
B.CT扫描
C.骨ECT
D.活检
E.免疫组化
