额叶肿瘤

A．情感淡漠，始动性差、动力缺乏、动作迟缓等阴性症状
B．常出现遗忘综合征，部分患者有痴呆表现
C．色觉失认、偏盲、视物变形、视物增多
D．幻嗅、幻味、似曾相识伴随有咀嚼撅嘴及吞咽动作
E．失用、失写、失算、手指失认

Many new means__________ to prevent the river ____________.

A．have found, from polluting

B．have found, from being polluted

C．have been found, from being polluted

D．has been found, from being polluted