B. people have known the high heels are bad for health for years

　　C. people haven’t known the high heels are bad for health yet

　　D. people will be warned that the high heels are bad for health soon

　　7. The best title for the passage may be ________.

　　A. Taking Healthy Knees into Consideration

　　B. High-heels Do Harm to Knees

　　C. Chunky Heels and Stiletto Heels

　　D. When Wearing High-heels

　　5—7、

　　阅读理解。

　　Today, ultrasonic(超声的) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds of thousands of times each second. This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film.

　　The new lightweight(轻量的) type of washing machine uses ultrasonic waves to get clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much the same way.

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