Foods quickly spoil and break down if they are not stored correctly. Heat and damp encourage increase in micro-organisms(微生物的), and sunlight can1vitamins in such food as milk. Therefore, most foods should be stored in a cool, dark and dry place.
    Some foods2bad quickly, such as meat, eggs and milk. They should be stored in a temperature of 5°C~10°C. In this temperature range, the activity of micro-organisms is3 In warm climates, this temperature can be kept4in a fridge or in the underground basement(地下室) of a house.
    Dry goods, such as flour and rice, should be kept at a slightly higher temperature. A temperature of 15°C is ideal. In Britain and northern European countries this means that the room in which dry foods are stored should5the general heating of the house. The room should also be well 6and, above all, dry. Damp very quickly causes the7of the green molds. These molds often grow on cheese if it is not stored properly.
    Fruits and vegetables need cool and damp8, so an underground basement usually9an excellent storage place. If the central heating unit is in the basement,10, it will not be ideal unless the unit and the pipes(管道) do not give out any heat.

利用天平进行定量试验，验证空气主要成分的科学家是（  ）

某校去年对实验器材的投资为2万元，预计今明两年的投资总额为8万元，若设该校这两年在实验器材投资上的平均增长率为x，则可列方程：____．

    五位壮士一面向顶峰攀登，一面依托大树和岩石向敌人射击。山路上又留下了许多具敌人的尸体。到了狼牙山峰顶，五位壮士居高临下，继续向紧跟在身后的敌人射击。不少敌人坠落山涧，粉身碎骨。班长马宝玉负伤了，子弹都打完了，只有胡福才手里还剩下一颗手榴弹。他刚要拧开盖子，马宝玉抢前一步，夺过手榴弹插在腰间，他猛地举起一块磨盘大的石头，大声喊道：“同志们！用石头砸！”顿时，石头像雹子一样，带着五位壮士的决心，带着中国人民的仇恨，向敌人头上砸去。山坡上传来一阵叽里呱啦的叫声，敌人纷纷滚落深谷。