60. 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．man-made building materials give off dangerous gases

　　61. 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

　　62. The indoor air pollution is caused by ______.

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

　　B．the man-made building materials and the limit of air-flow

　　C．the building things that are made of man-made materials

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

　　63. 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

　　C

　　No one knows for sure when advertising first started. It is possible that it grew out of the discovery that some people did certain kinds of work better than others did them. That led to the concept of specialization, which means that people would specialize, or focus, on doing one specific job.

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