为了测量由两节干电池组成的电池组的电动势和内阻，某小组的同学从实验室 里选取了以下器材：两节干电池组成的电池组（电动势约3V，内阻约1Ω）/电压表（量 程0〜3V，内阻约1OkΩ），电阻箱（0〜999.9Ω），保护电阻R₀（阻值5Ω），开关一只，导 线若干．

①在图1所示的实验原理实物图中，该同学已完成了部 分导线的连接，为使电压表示数有较大的变化范围，请用笔画线代替导线完成余下的导线连接．____

②实验中，同学们试着用多用电表代替电压表测量电压．在完成机械调零之后，应将选择幵关拨到表盘上的____区域（选填“Ω”、“V”、或“A“）．

③同学们根据以上的实验原理和方法进行了实验，通过 调节电阻箱的电阻值，得到了多组电阻箱阻值R和电压表示数U，并以 $\frac{1}{U}$ 为纵坐标， $\frac{1}{R}$ 为横坐标，作出 $\frac{1}{U}$ ﹣ $\frac{1}{R}$ 的关系图线（该图线为一条直线）如图2所示，由图线可求得电池组的电动势____V，内阻r=____Ω．（结果保留三位有效数字）

【男生女生　　快乐成长】青春是美丽的，情感是真挚的。在本周家校交流会上，福福记录下以下发言片段：

片段一：鼎鼎悄悄地对同桌说：有人偷偷喜欢我，让我知道了。

片段二：福福爸爸说：男同学往家里打电话，我女儿根本不让我知道。我只要一问，她就说：“问那么多干嘛？”因为这件事，我们父女俩闹得挺不愉快。我不愿意让她过早地跟男孩子接触。会议结束后，班主任请福福整理以下提纲，准备周一班会课上发言，请你帮助福福。

    Whether you're a child, teenager, young adult or are middle-aged, respecting your parents is an important value. Your parents are the people who raise you, devoting time, energy and money to your development.____Whatever your age, there are 4 ways to show respect.

    Respect their belongings.

    One important way to show respect is to show regard for the things important to your parents. For younger children, this may mean not touching jewelry or other valuable things.____Don't take advantage of your parents' kindness and generosity. And never borrow things without asking first.

    Punctuality

    ____Therefore, always be on time. For teenagers, showing up on time means coming home by curfew (宵禁). Adult children should show up on time for family dinners or events, or to pick a parent up for a medical appointment. Call if you're going to be late because parents worry about children, whatever their age.

    ____

    Remembering birthdays, anniversaries and other special days is a sign that you honor your parents. Make plans to take them to lunch or dinner or bake a cake or cookies. Most parents don't expect expensive gifts, but a handmade gift is always appreciated, a phone call from a grown child who lives too far for a visit is a welcome sign of respect.

    Be kind.

    Kind words and affection are simple ways to show respect. Tell your parents you love them. Listen and allow your parents to speak without interruption. Show a sincere interest in what your parents have to say. Be patient with your parents and don t rush them. Never talk back or be rude or disrespectful. Acknowledge your parents' achievements. ____

A. Parents should help children build self-confidence.

B. Celebrate with them.

C Lateness shows a lack of respect.

D. Treat your parents the way you would like to be treated.

E. And they love you unconditionally throughout your life.

F. Being respectful helps build positive relationships with others.

G. For grown children, respect may mean returning a borrowed tool in good condition and on time.