18．Solutions　根据第五段There are numerous ways for mild sleeplessness at home.可判断。

　　19．tea or coffee　根据第五段Prepare your body for sleep by avoiding drinks such as tea or coffee before bed.可判断。

　　20．relaxing exercises　根据第五段Don’t exercise too much before bedtime; instead, do something to relax yourself.可判断。

　　C

　　21．Definition/Meaning/Concept　根据第一段Air pollution refers to the introduction of some harmful gases and particulate matter(颗粒物质) in the Earth’s atmosphere which in turn results in pollution of air…可判断。

　　22．pollutes air　根据第一段Air pollution refers to the introduction of some harmful gases and particulate matter(颗粒物质) in the Earth’s atmosphere which in turn results in pollution of air…可判断。

　　23．Causes　根据第一段There exist natural causes of air pollution可判断。

　　24．Natural　根据第一段There exist natural causes of air pollution可判断。

　　25．with oxygen　根据第二段When polluted air is inhaled(吸入) for breathing oxygen, several harmful gases are also inhaled along with this life­saving gas. These harmful gases are believed to affect animals in the same manner in which they affect humans.可判断。

　　26．damaging their organs　根据第二段Experts also suggest that the particulate matter the animals inhale over a long period can gather in their tissues and cause damage to their organs in the long run.可判断。

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