虽然慢了，但是保证准确！1. D依据：They made the change because they wanted every basketball they use to feel and bounce（弹起）the same. Not all leather balls are exactly alike in weight or how they bounce, but the synthetic balls are.2. A依据：For example, the scientists studied friction（摩擦力）, which in this case affects the ability of a player to hold onto a ball. “The greater the friction, the better it will stick to his hand,” explains a scientist.3. C依据：The scientists also tested bounce and found that the logo（商标）printed on the new balls made their surface uneven（不平）and caused them to bounce a little strangely compared with the leather balls.4. D依据：That’s because sweat（汗水）stays on the surface of the synthetic balls but gets taken into the leather balls.5. B依据：In January, the NBA went back to using the leather balls. They aren’t perfect, but for now, that’s just the way the ball bounces.
海的晨宝贝
