As a professor，Gadgil encourages his students to stay positive about finding solutions to hard problems.“Be optimistic when you try a hard problem．”he says. “It’s when you solve a large problem that you can have a big impact on the world”

　　41. Gadgil was given Lemelson-MIT Award for___________.

　　A. his teaching experience

　　B. his new physical research

　　C. his vast knowledge

　　D. his helpful inventions

　　42. What call we learn about UV Waterworks?

　　A. It's Gadgil’s first invention

　　B. It’s used to clean water．

　　C. it was designed for his home country D. It saved 10，000 people in total

　　43 The underlined word “contamninated”in Paragraph 3 means__________.

　　A. wasted

　　B. consumed

　　C. polluted

　　D. canned

　　44. According to the last paragraph，Gadgil encourages his students__________.

　　A. to learn lessons from failures

　　B. to find problems in peaceful life

　　C. to make inventions to help poor people

　　D. to be confident when facing diffculties

　　45.Which of the following can best describe Gadgil?

　　A. Caring and optimistic.

　　B. Independent and positive.

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