马克思指出:“资产阶级不仅锻造了置自身于死地的武器，它还产生了将要运用这一武器的人:现代的工人，即无产者。”这里的武器是指（ ）
A：暴力革命
B：代议制民主
C：先进的生产力
D：科学社会主义
同纬度甲乙两地海拔分别是720米和1720米，甲地气温28.8℃，乙地气温为（ ）。
Progress suggests a person's ability to change the way he is living at the moment and it must ______ a better life and a better way of doing things.
Fresh food is good for you . But you have to _______it first because sometimes it is a little dirty.
