题目

Should people who study science and business pay less for college than people who focus on art and history? That may soon be the case at Florida’s state universities.        In tough economic times, Florida governor Rick Scott wants to lead college students toward careers that will pay off after graduation. There are more jobs available in Florida in the fields of business, engineering, healthcare, science and technology. So why not encourage students to focus on these “high-demand” subjects by charging less tuition (学费) for them?        “We assume students go t在用打点计时器研究匀变速直线运动规律时：①若所使用的交流电频率为50Hz，打点计时器每隔______s打一次点．②根据打出的纸带，可以不利用公式就能直接得到的物理量是：______A．时间间隔B．位移C．加速度 D．平均速度．