题目

将灵敏电位计的两极如图所示分别置于膝跳反射反射弧中的a处外表面和b处内表面（此时指针情况为参照），图中ac=db，若在c，d两点同时对神经细胞给以能引起兴奋的刺激，有关该实验的论述，正确的是（ ） A.a所在的神经元是感觉神经元B.一般情况下，在动物体内，兴奋在该反射弧的神经纤维上进行双向传导，在突触处进行单向传递C.当指针第一次偏转时，引起该次偏转的兴奋一定来自d左侧D.神经细胞膜在正常状态下，会出现膜外K＋浓度高于膜内的任务型阅读。     British towns and cities have rich experience in providing accommodation (膳宿) for students and thereare many cheap, comfortable and safe places to live.      You should always try to arrange your long-term accommodation before leaving home. Your school should be able to help you with it. When you are accepted by a school, you will usually receive a package ofinformation including accommodation information. Complete the accommodation application form and returnit before the deadline (最后期限). If the school accommodation is not available, the accommodation advisory (顾问的) office of your school can help you find private accommodation.      If you're coming to the UK for the first time, accommodation provided by your school might be the most suitable choice. This is a choice taken by more than half of the international students. There are plenty of advantages of living in accommodation provided by the school: you can live close to where you are studying;you will get to know other students easily; and most importantly, you will be living in a safer environment. This kind of accommodation is also affordable: a room in a self-catering (自己做饭的) student apartment usually costs from 180 to 360 pounds per month. To live in a place where meals are included you are expectedto pay from 320 to 400 pounds per month.     If you choose to rent accommodation in private houses, the choices are lodgings, private hostels (招待所) and bedsits (卧室兼起居室). In a lodging, your landlord/landlady lives in the same house, possibly with his / her family, and prepares meals for you. For hostel accommodation and lodgings where meals are included, you can expect to pay from 300 to 400 pounds per month. For bedsit, you would pay from 200 to 380 poundsper month.