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?

　　4．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

　　答案　B

　　解析　推理判断题。由文章最后一段第一句“Today we benefit from countless inventions and innovations.”可知信号灯和雨刮器这些小的发明使我们受益。由第一段可知信号灯和雨刮器等的发明者不怎么出名，故选B项。

　　5．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

　　答案　D

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