如图所示的电路中，电源的电压保持不变，R₁为定值电阻，R₂为滑动变阻器，闭合开关S，滑片P向左移动过程中，下列说法正确的是（   ）

“12315”是全国工商行政管理机关依托12315电话，受理消费者申诉举报，调解消费者权益纠纷，查处侵害消费者权益案件和制售假冒伪劣商品等经济违法行为，监督管理市场和行政执法的一项重要的工作。“12315”体现了
①政府为群众排忧解难 　　
②政府为群众求助或投诉提供了有效途径
③要坚持从群众中来到群众中去的工作方法 　
④政府是我国的国家权力机关

在以“力”为主题的辩论赛中，正方和反方提出了许多观点，小明把他们的观点归纳整理如下表．你认为正确的观点有（　　）

①两个物体相接触，就一定有力的作用；②两个物体相接触，但不一定有力的作用；③力的产生至少涉及两个物体；④一个物体也可以产生力的作用；⑤力的维持物体运动状态的原因；⑥力是改变物体运动状态的原因．

The following are some advertisements(广告). Read them and answer the questions.

No. 1   A big house with a big yard for a big family. There are four bedrooms, three bathrooms, a big living room and a great kitchen. The house costs $2,000 a month. Call Mrs. Morris at 4560987.

No. 2   Great location! A nice new flat building with a swimming pool. There is a big living room, a bedroom, a bathroom and a nice kitchen. It is $1,200 a month. The phone number is 7610201. You can ask Dana for help.

No. 3   There is a town house for you. The first floor is for playing games, and the second floor is for living. On the second floor, there is a living room, two bedrooms, two bathrooms and a nice big kitchen. There is also a great yard behind the house for children. It is $1,7000 a month. Please call Nathan at 4645 2436.

No. 4  Here is your new home! It is a big flat with three bedrooms, a living room, a dining room and a bathroom. The flat has a good parking place(停车位) but no yard. It is $1,600 a month. Call Wilson at 533 0202.

在测电阻的实验中，电源用两节新干电池串联，滑动变阻器的规格是“10Ω 1.5A”，某同学连接了如图所示的电路（电路元件完好，接线柱接线牢固）。