1. Why does a paint manufacturer use ultrasound to do a better job of blending colors?

　　A. Because it is cheap to use ultrasound to blend colors.

　　B. Because the waves move the liquid so quickly that it can make materials mix quickly or dissolve in liquids.

　　C. Because they can mix chemicals by the use of sound waves.

　　D. Because the waves can clean the paint.

　　2. What properties does ultrasound wave have?

　　A. Homogenizes and sterilizes the milk.

　　B. Mix materials and break droplets.

　　C. Kill germs and sterilize milk.

　　D. Move liquids quickly.

　　3. What exists in the raw milk?

　　A. Little drops of butter fat.

　　B. Small holes.

　　C. Fat droplets and germs.

　　D. Chemicals.

　　4. Where is ultrasound wave not used?

　　A. In the paint manufacture.

　　B. In the shop mixing bread flour.

　　C. In the film-making company.

　　D. In the dairy industry.

　　1. B 事实细节题。根据其上句 This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids 可知，答案选 B。

　　2. D 事实细节题。根据文章最后一段的第 1 句 Ultrasonic waves can shake a liquid so fast that tiny holes form all through it可知，答案选 D。

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