Read the passage below carefully, and then choose the best answer:
Durable Ceramic Beauty
Inside an art and craft workshop, a young woman sits in front of a pottery wheel. The machine contains a large lump of clay which she molds into the shape of an elaborate bowl. Later, when she is satisfied with its appearance, it will be baked in an oven until it solidifies. Then she adds decorative paints to add some style. In the end, this ceramic pot will be both a handy utility for eating as well as a work of art. Humans have been working with ceramics for about 30,000 years, making it one of the oldest industries on the planet. In ancient times, ceramics enabled humans to make containers to store food and drinks, as well as bricks for buildings, but as time went on, people found other uses for this prehistoric technology. Techniques were added to give these products more eye-catching designs. Objects were often coated with glaze, so they would be smoother and more pleasant to touch. This helped to transform these practical items into works of art. People would pay large amounts of money for pieces of ceramic art and use them to decorate their homes. In modern times, architects and inventors discovered that ceramic offered the perfect balance between beauty and durability, and started using it in their products as well. Ceramics have found a home in the world of automobiles as they are used to produce several products. They are often used to make brake discs, engines, and other parts because ceramics are able to withstand extremely hot temperatures. Ceramics also play a part in the world of medicine, as their flexibility and strength are perfect for creating sturdy dental implants. Other doctors are using them to replace damaged bones because they are able to bond with tissues in the body without causing adverse reactions. In many kitchens today, you will also find ceramic knives. Once they are produced, the hard edges of these blades rarely need to be sharpened. Unlike metal knives, they won’t rust when exposed to difficult conditions. Ceramics also help to make it possible for humans to travel into space. Space shuttles are designed with ceramic tiles because they are one of the few materials that can stand the extreme heat when reentering the Earth’s atmosphere, plus they don’t wear out easily. With so many useful applications, it is hard to deny that ceramic technology is out of this world.
6. What is a benefit of using a ceramic knife?

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