在反比例函数$y=\frac{m}{x}$中，当x＞0时，y随x的增大而增大，则二次函数y＝m x²＋m x的图象大致是下图中的（  ）

阅读理解 阅读下列短文，选出最佳答案。

    “I will think of it.” It is easy to say this, but do you know what great things have come from thinking?

    Sir Isaac Newton was sitting in his garden when he saw an apple fall from a tree. He began to think and tried to find out why the apple fell. Then he discovered how the sun, moon, and stars are kept in their places.

    A boy named James Watt sat quietly by the fire, watching the lid of the kettle move up and down. He wanted to find out why the steam in the kettle moved the lid. From that time he went on thinking and thinking. And when he became a man, he improved the steam engine (蒸汽机) so much that it could easily do the work of many horses.

     James Ferguson was a poor boy. Once, seeing the inside of a watch, he wondered. “Why should I not make a watch?” But how could he get the materials to make the mainspring (钟表的主发条)? He soon found he could make it with whalebone (鲸骨). He then made a wooden clock which kept good time. His motto (座右铭) was “I will think of it.” And he made his thoughts useful to himself and the world. 

    Boys and girls, when you have a difficult lesson to learn, don't lose heart, and don't ask someone for help before helping yourselves. Think, and by thinking you will learn how to think to some purpose.

如图所示，要使灯泡L₂发光，必须闭合的开关是（    ）

阅读《三峡》 ，回答相关问题。
                                                                                          三  峡

                                                                                          郦道元
        自三峡七百里中，两岸连山，略无阙处。重岩叠嶂，隐天蔽日，自非亭午夜分，不见曦月。   
        至于夏水襄陵，沿溯阻绝。或王命急宣，有时朝发白帝，暮到江陵，其间千二百里，虽乘奔御风，不以疾也。   
        春冬之时，则素湍绿潭，回清倒影，绝巘多生怪柏，悬泉瀑布，飞漱其间，清荣峻茂，良多趣味。   
        每至晴初霜旦，林寒涧肃，常有高猿长啸，属引凄异，空谷传响，哀转久绝。故渔者歌曰：“巴东三峡巫峡长，猿鸣三声泪沾裳！”