题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。 Improve your memory Some people often complain about their poor memory. Actually there are several ways to keep your memory sharp. This article will show you some simple tips. . When you say these things, you begin to plant the thought in your mind and it may become true. Tell yourself you can remember anything as long as you put your mind to the task. You will see an improvement in your memory. . If you have trouble remembering phone numbers or other blocks of numbers, i1．若P是正四面体V-ABC的侧面VBC上一点，点P到平面ABC的距离与到点V的距离相等，则动点P的轨迹为（　　）A．一条线段B．椭圆的一部分C．双曲线的一部分D．抛物线的一部分