单项选择题A. It’s hard to define how much effect it has on people.B. People don’t have the equipment to measure it.C. It does not leave any trace once the noise disappears.D. It’s hard to measure it.
单项选择题A. To ask for advisers’ advice. B. To make sure if the school is allowed to provide distance learning program by CHEA. C. To make sure if the school offers you a degree. D. To avoid a diploma mill.