题目

现有一特殊电池，它的电动势E约为9 V，内阻r约为40 Ω，已知该电池允许输出的最大电流为50 mA.为了测定这个电池的电动势和内阻，某同学利用如图2－10－15甲所示的电路进行实验，图中电流表的内阻RA已经测出，阻值为5 Ω，R为电阻箱，阻值范围0～999.9 Ω，R0为定值电阻，对电路起保护作用． (1)实验室备有的定值电阻R0有以下几种规格：A．10 ΩB．50 Ω C．150 Ω  D．500 Ω 本实验选用哪一种规格的定值电阻最好________． (2)该同学接入符合要求的R0后，闭合第二节读写任务（共1小题，满分25分）阅读下面的短文，然后按照要求写一篇150词左右的英语短文。A little boy is telling his Grandma how "everything" is going wrong, school, family problems, severe health problems, etc.Meanwhile, Grandma is baking a cake. She asks her grandson if he would like a cake, which, of course, he does."Here, have some cooking oil.""Terrible!" says the boy. "How about a couple raw eggs?" " Terrible! Grandma!" "Would you like some flour then? Or maybe baking soda?" "Grandma, those are all awful!" To which Grandma replies:“Yes, all those things seem bad by themselves, but when they are put together in the right way, they make a wonderfully delicious cake! “Life works the same way. Many times we wonder why it would let us go through such bad and difficult times. But life knows that when it puts these things all in its order, they always work for good! “The trials（考验）of life serve a meaningful purpose in making us stronger. Do not lose heart if life is not easy for you right now, but encourage yourself and know you will be much stronger mentally and physically because of the trials of life. ”[写作内容]1．以约30个词概括这段短文的内容；2．然后以约120个词以“Facing the Trials of Life”为题进行议论，内容包括： (1) 你阅读短文后的感受； (2) 简述你经历过的一次困难或考验； (3) 你认为应当如何看待生活中的考验。[写作要求]1．在作文中可以使用自己亲身的经历或虚构的故事，也可以参照阅读材料的内容但不得直接引用原文中的句子；2．作文中不能出现真实姓名和学校名称。[评分标准]概括准确，语言规范，内容合适，篇章连贯。