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节选自《孔子游春》

    孔子凝望着泗水的绿波，意味深长地说：“水奔流不息，是哺育一切生灵的乳汁，它好像有德行。水没有一定的形状，或方或长，流必向下，和顺温柔，它好像有情义。水穿山岩，凿石壁，毫无惧色，它好像有志向。万物入水，必能荡涤污垢，它好像善施教化……由此看来，水是真君子啊！

如图甲所示，两个灯泡串联在电路中，电源电压为6V，L₁ 的额定电压为3V，L₂的额定电压为2V．通过两个灯泡 的电流与其两端电压的关系如图5乙所示．闭合开关后，当滑动变阻器的滑片滑至中点时，其中一个灯泡正常发光，另一个不损坏．下列四个结论：①正常发光的小灯泡是L₂；②L₁额定功率为0.45W；③滑动变阻器的最大阻值是20Ω；④若将滑动变阻器的滑片向右移动，L₂的电阻将逐渐变小．正确的是（　　）

    There was a man who had four sons. He hoped his sons could learn not to judge things too quickly. So he gave them a task in turn,____ (ask) them to go to see a pear tree at a distance____(separate).

    The first son set out in winter, the second in spring, the third in summer, and the____young)in autumn.

    When all of them returned home, they were called together____(describe) what they had seen. The first son complained the tree was____ (bend) and ugly. The second son said the tree was covered with buds(花蕾)and full of hope. The third son said it was full of flowers____smelled so sweet and that he had____seen such beautiful scenery. The last son disagreed____all or them, saying it was filled with fruits, full of life and content.

    The man told his four sons that they were all correct, but they only saw the tree in____season, He taught them that the value of a person could only be measure when all the seasons were over.

    If you give up in winter, you____(miss) the hope of spring, the beauty of summer, and the harvest of autumn in your life.

如图所示，实线表示电场线，虚线表示只受电场力作用的带电粒子的运动轨迹．粒子先经过M点，再经过N点，以下正确的是（   ）