题目

已知点，圆:，过点的动直线与圆交于两点，线段的中点为，为坐标原点. （1）求的轨迹方程； （2）当时，求的方程及的面积 答案：Exam anxiety is something that almost every person experiences during his or her student life. Little anxiety actually helps one      and work hard for the exams. However, if students spend all their time in feeling     , a lot of valuable study time would be lost.In this competitive world,      cause a lot of nervousness in students. For some, exam anxiety encourages them to work hard, while for others it may be the root cause for poor performance, leading to academic      and lack of confidence. In fact, some students are anxious by nature and easily get nervous when they face a(n)     situation. They will think      even if they have prepared well. They fear that they may        what they have studied, and when it is too much, their      is likely to come true.One of the most important methods of      exam anxiety is to prepare well in advance. Studying regularly for a few hours every day helps increase the      of students. If students are not able to handle anxiety or nervousness, they could talk to their teachers, parents, friends or instructors.      should also avoid giving pressure to their kids to do well. Creating a peaceful and      atmosphere at home can be greatly helpful.To      and sleep properly is also important. Students tend to avoid sleep and starve themselves due to anxiety, but it is      to their academic performance and health. It’s better that students should plan their time well and take proper breaks between studies. They should always remember to set aside some time for their      since some entertainment helps them relax and concentrate.小题1:A．concentrateB．relaxC．succeedD．experience小题2:A．curiousB．confidentC．anxiousD．calm小题3:A．plansB．breaksC．jobsD．exams小题4:A．failureB．achievementC．preparationD．performance小题5:A．peacefulB．stressfulC．naturalD．avoidable小题6:A．positivelyB．confidentlyC．intentionallyD．negatively小题7:A．rememberB．forgetC．confuseD．lose小题8:A．fearB．dreamC．expectationD．competition小题9:A．increasingB．feelingC．avoidingD．creating小题10:A．relaxationB．pressureC．nervousnessD．confidence小题11:A．TeachersB．ParentsC．FriendsD．Instructors小题12:A．relaxingB．excitingC．depressingD．worrying小题13:A．learnB．playC．restD．eat小题14:A．helpfulB．harmfulC．importantD．nice小题15:A．studiesB．habitsC．hobbiesD．meals