单选题 Pirated compact disks and floppy disks remained the second biggest vehicle for the spread of computer viruses despite the governments' determined efforts to quash software piracy.
【正确答案】 D
【答案解析】句意：尽管政府坚决力图杜绝盗版软件，盗版光盘和软盘依然是计算机病毒的第二大传播媒介。quash取消；restrict限制，约束；boost推进；prevent防止，预防；crush压碎，碾碎。