Today many governments have special departments which protect customers and workers. In the U. S．， for example, there is a department which tests new airplanes and gives warnings about possible problems. It also makes the rules that aircraft producers must follow. Another department controls the foods and drugs that companies sell.A third department looks at the places where people work，and then reports any company that is breaking the laws which protect the health and safety of workers. Of course，new government departments and new laws cannot prevent every accident or illness，but they are having some good results. Our work places are safer and cleaner than before. The planes and cars which we use for travel are better. Producers are thinking more about the safety and health of the people who buy and use their products.

　　24．The main topic of the passage is________.

　　A．conditions in the work place

　　B．the freedom of industries in the past

　　C．changes in industrial production

　　D．the safety and health of workers and customers

　　25．It can be inferred from the passage that in the past________.

　　A．workers often got ill because of the poor working conditions

　　B．companies were free to put out any products they wanted to

　　C．many people were killed by dangerous products

　　D．industries were as careful in management as they are today

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