What causes the chemicals to build up and harm us in offices? As _______ and homes often have inadequate ventilation, these chemicals can ______ to become health nuisances. Their toxic _______ are only now being slowly _______.
举一反三
- Many foods are suspected of being __________ to health because of the chemicals and additives they contain. A: instrucmental B: disastrous C: additional D: detrimental
- There are often ( fewer / more ) unhealthy chemicals in bottled water than in tap water. These chemicals come from the plastic in the bottles.
- All of the following are chemicals that make up CFCs EXCEPT:
- 精细化学品的英文名为： A: Heavy chemicals B: Fine chemicals C: Refine chemicals D: Special chemicals
- It is the same old story of not being grateful for what we have until we lose it, of not being conscious of health until we are ill." In this sentence, “health” can be translated into "健康之宝贵”.