题目

Do you get nervous and not know what to do the day before an exam? Read these tips（技巧）. 1.       Take the day off from studying. Research has shown that studying right before an exam is more likely to hurt than to help. Why? Because the information studied is still floating around in your short-term memory and actually interferes (干扰) recall of the information that you have studied days, weeks or even months before. 2.       Plan something fun to do as a reward for all the effort you have put into getting ready. Call friends to make plans for the time after the如图，∠A=15°，AB=BC=CD=DE=EF，则∠DEF等于（ ） A.90°B.75°C.70°D.60°