题干

依次填入下面一段文字横线处的语句,衔接最恰当的一是(   )
物体在快速运动时,                   ,人眼仍能继续保留其影像0.1-0.4秒左右的图像,这种现象被称为视觉暂留现象。               。人眼观看物体时,               ,感觉到物体的像。但当物体移去时,视神经对物体的印象不会立即消失,而要延续0.1 -0.4秒的时间,                      
①成像于视网膜上,并由视神经输入人脑
② 当人眼所看到的影像消失后
③ 人眼的这种性质被称为“眼睛的视觉暂留”
④ 是人眼具有的一种性质

A:②④①③

B:②①③④

C:①③②④

D:①④③②

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答案(点此获取答案解析)

A

同类题2

阅读下面短文,掌握其大意,然后从下列各题所给的四个选项(A、B、C和D)中,选出最佳选项。

    It was 4 o'clock in the morning, when I received the phone call.

  “This is the emergency room calling and your son was just 1 in with severe burns on his face, neck and arms. We have called for a(n)2 and are going to fly him to the burn unit in Seattle.” Seattle was 350 miles from his college, so we knew immediately this was 3.

    The doctor described the 4, which caused the burns. At 6 am, our son and his friends decided to barbecue hamburgers in the courtyard of their apartment. When they 5 the charcoal(木炭), it burst into flames because they had sprayed too much gasoline. The flames 6 my son's shirt tail and shot from his waist to well over his head.

      7, one of the boys who was quick—minded grasped my son and 8 him on the grass. While it saved his life, it was not in 9 to save him from severe burns and the terrible scars.

    After he 10 from the treatments, the doctors told him they would not do plastic surgery(整容) for 6 months 11 it takes that long for the skin to stop wrinkling(起皱). So, he had to return to college with scars typical of severe burns.

    When I was a child, my mother told my sister,who had a 10-inch very  12 scar on her arm, “Nancy,if you ignore the scar, other people will ignore it. It does not mean they will not 13 it, but it means it will not matter to them if it doesn't matter to you.

     I 14 this wisdom on to my son. He took my advice to 15 and returned to school with his head held high—glad he was alive.

By the end of the six-month waiting period, he decided that the scars did not 16. So he made the 17 to give up any plastic surgery.

    We all have “scars” that we believe 18 people to keep away from us. And we spend a lot of time thinking that if only we looked differently, or dressed differently, people would like us better. But you see, people will only judge you by your looks or your clothes if you are judging yourself by these same19 standards. Put your imperfections out of your mind and concentrate on what you value 20 yourself, and your beauty will shine through.