Are tears important？Yes，they keep your eyes wet，but they also help them stay clean.Every time we blink，we wash the surface of the eye with tears.In this way we wash out dust and other things that get into the eyes.We should not rub them when they feel uncomfortable，though；we should just blink，or clean them out with clean water and cotton.

　　When you've been reading for a long time，try this.Hold your head straight，and look straight out in front of you.The eyes have muscles that move them from side to side and up and down without you moving your head.This is why you need to rest your eyes when they are tired.

　　31．Put the following steps in the right order.

　　a．Light passes through the lens.

　　b．Light strikes the object and bounces off it.

　　c．Light travels through the pupils.

　　d．The optic nerve sends the image to the brain.

　　A．a，c，b，d

　　B．b，c，a，d

　　C．b，a，c，d

　　D．a，b，c，d

　　【解析】　细节理解题。根据第二段可知，物体反射的光线先是通过瞳孔，然后再通过水晶体，水晶体将看到的物体的图像反过来传到眼底，到达视网膜的视神经上，最后传到大脑，所以正确的顺序是B。

　　【答案】　B

　　32．When the light that bounces off an object goes through the lens，the image of the object becomes________.

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