D. man-made building materials give off dangerous gases

　　60．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

　　61．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

　　62．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

　　This is VOA. The National Cryptologic Museum is on Fort George G. Meade, a military base near Washington, DC. The method of hiding exact meanings is called coding. People have used secret codes throughout history to protect important information. The National Cryptologic Museum celebrated 60 years of cryptologic excellence in 2017. One event there marked the sixtieth anniversary of the National Security Agency. Two former NSA workers shared their memories of operating a code machine called Sigaba.

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