You have often looked into a mirror（镜子），of course，But you haven't seen the real picture of your face yet．And why couldn't you see it？When you look into a mirror．You don't see your face as other people see it．You see a reversedpicture．If you close your left eye，your picture closes its right eye．If you touch your right ear with your right hand，your picture touches its left ear with its left hand．

If you have two small mirrors，you can see you faces as your friends see it．You hold the two mirrors at right angles（角度）to each other and look into them．After some practice you will be able to see the real picture of your face．

Now close your left eye and your picture closes its left eye too．Touch your right ear with your right hand and your picture touches its right ear with its right hand！This is because each mirror reflected（反射）the picture in the other mirror，So you see a reversed picture of a reversed picture，which of course，is the same as the real picture．

根据短文内容，选择最佳答案，并在答题卡上将选定的答案标号涂黑．

66．When you look into a mirror，you couldn't see 　　．

A．	your face as others see it
B．	the picture of yourself
C．	the picture of your face
D．	the picture of your eyes

67．What does the underlined word" reversed"mean in this passage？ 　　

A．	相同的
B．	相反的
C．	模拟的
D．	虚拟的

68．According to the first paragraph of the passage，if you close your left eye，your picture in the mirror 　　．

A．	touches its left ear
B．	closes its left eye
C．	touches its right car
D．	closes its right eye

69．Which of the following pictures is right according to the second paragraph of the passage？ 　　

（M＝mirror，P＝person）

70．We can learn something about 　　from the passage．

A．	body language
B．	physical education
C．	optical illusions
D．	television invention．