a lever(操作杆) on the inside of a vehicle that would control an arm on the outside，

　　became the first windshield wiper.

　　Today we benefit from countless inventions and innovations. It’s hard to imagine driving without Garrett A. Morgan’s traffic light. It’s equally impossible to picture a world without Katherine J. Blodgett’s innovation that makes glass invisible. Can you picture life without clear windows and eyeglasses？

　　31. By mentioning “traffic light” and “windshield wiper”，

　　the author indicates that countless inventions are________.

　　A．beneficial，

　　because their inventors are famous

　　B．beneficial，

　　though their inventors are less famous

　　C．not useful，

　　because their inventors are less famous

　　D．not useful，

　　though their inventors are famous

　　32. Professor Joan McLean’s course aims to________.

　　A．add colour and variety to students’ campus life

　　B．inform students of the windshield wiper’s invention

　　C．carry out the requirements by Mountain University

　　D．prepare students to try their own inventions

　　33. Tommy Lee’s invention of the unbreakable umbrella was________.

　　A．not eventually accepted by the umbrella producer

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