3．Last year，a special kind of glove came out．It was invented to help bind people to learn Braille，which is a special system for the blind to read by touching．Shaking motors （震动马达） are put on each finger of the glove．They can make different sounds to tell a user which letter he is touching．Recently，two British college students have invented another special glove for the blind．It can make the user feel small and quick movements．An ultrasonic sensor（超声波传感器）with a battery is put on the back of the glove．When the user wearing the glove is close to an object（物体），ultrasonic waves（ 超声波）from the glove are sent out （发出）．As soon as they hit the object in front，the waves will return to the glove．Then the waves cause the glove to shake．And the ultrasonic sensor makes different kinds of sounds．The sounds make the user know how far he is from the object．
In the college invention competition，the two students got first prize and won 1，540pounds．One of the designers said，"Now the ultrasonic sensor on the glove is quite large．We're going to use the money to develop a smaller and lighter ultrasonic sensor．"
根据短文内容选择最佳答案．
46．The underlined word"Braille"in the passage means"A"in Chinese．
A．盲文
B．口语
C．手语
47．The glove with an ultrasonic sensorB．
A．can make only one kind of sound
B．can make the user feel small and quick movements
C．was designed by two American college students
48．PictureC shows how the glove with an ultrasonic sensor works according to the passage．
49．Which of the following is TRUE according to the passage？C
A．The sounds from the ultrasonic sensor make the user know what the object is．
B．The two college students wanted to use 15，400pounds to develop the glove．
C．The glove with shaking motors was invented for blind people．
50．What is the best title for this passage？B
A．The Way to Make Gloves
B．Two Kinds of Special Gloves
C．An Ultrasonic Sensor and Shaking Motors．
