早在战国时期，我国古代著名教育家、思想家墨子就在研究小孔成像的现象．如图所示，他用蜡烛作为光源，在木板上钻了一个小孔，发现透过小孔的光能在墙壁上形成一个倒立的像．下列说法正确的是（ ）
A．木板上的小孔一定是圆形的
B．保持蜡烛和墙的位置不变，将木板向靠近墙的方向移动，蜡烛在墙上的像会变大
C．小孔成像现象能说明光沿直线传播
D．蜡烛在墙上呈的像是虚像
A、小孔成像成的是物体的像，与小孔的形状无关，故A不正确；
B、保持蜡烛和墙的位置不变，将木板向靠近墙的方向移动，因为成像的大小取决于像到小孔的距离，则木板与小孔距离越小，像也越小，故B不正确；
C、小孔成像是由光的沿直线传播形成的，故C正确；
D、蜡烛在墙上呈的像是倒立的实像，故D不正确．
故选C．
| 阅读理解。 |
Dear Sir or Madam, |
| 1. Kelly and her son were feeding ducks in Smethwick Park on . |
| A. Monday B. Tuesday C. Saturday D. Sunday |
| 2. Kelly was fined for . |
| A. making noises B. killing ducks C. cutting trees D. littering |
| 3. Kelly's son feels when he feeds the ducks every week. |
| A. sorry B. happy C. hungry D. angry |
| 4. Department of Public Service made the rule mainly because . |
| A. enough food had caused deaths of ducks B. feeding ducks had damaged the environment of the park C. the bread caused a mess in the park D. the park could make money from the fine |
| 5. According to the letter from Jackson to Kelly, Department of Public Service . |
| A. says Kelly doesn't have to pay the fine this time B. says sorry to Kelly for what the warden did C. believes the rule isn't perfect D. will set up a Bulletin Board at the gate of the park |