【加练半小时】2017届高考英语一轮复习练习：第16练自然与环保类（二）（含解析）_高考复习指南

　　5．Generally speaking，indoor air pollution may be more harmful than the air outside because

　　A．indoor air pollution can often make people seriously ill

　　B．there may be more harmful gases outside the buildings

　　C．the air indoors is polluted，which is very harmful

　　D．manmade building materials give off dangerous gases

　　6．Some kind of indoor pollution can be found in

　　A．every modern house

　　B．every old house

　　C．all kinds of houses

　　D．all kinds of offices

　　7．The indoor air pollution is caused by

　　A．the building way that the builders want to save energy

　　B．the manmade building materials and the limit of airflow

　　C．the building things that are made of manmade materials

　　D．the limit of the flow of air between inside and outside

　　8．The reason why we should use different kinds of plants to clean the air is that

　　A．plants can let out all kinds of pollutants indoors

　　B．plants may take in more oxygen which people need

　　C．plants can absorb all kinds of harmful indoor chemicals

　　D．plants can make our houses prettier and more healthy

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