阅读理解

　　Mary Masterman hasn't decided where she will attend college, but when she does, she'll have plenty of money to pay for it．The 17-year-old took home a ＄100,000 scholarship Tuesday as the top winner of the 2007 Intel Science Talent Search．

　　"It was a complete surprise," said the senior at Westmoore High School in Oklahoma City, Oklahoma．"I wasn't expecting it．" Masterman earned first place at this year's competition by building a low-budget spectrograph(摄谱仪)－ an instrument that identifies the unique characteristics, or "fingerprints," of different molecules．Spectrographs are used in a variety of fields, including astronomy, medicine, and law enforcement．They can sense the presence of explosives or drugs, and they can also help determine the age of a piece of artwork．

　　Normally, the cost of a spectrograph can run as high as ＄100,000．Mary, however, built her device－which she crafted from lenses, a laser, aluminum(铝)tubing, and a camera－for just ＄300．"I wanted to build one that was lower-costing so it would be more available to anyone interested in spectrography," she said．

　　Sticking to a budget was only half the battle．Getting the machine to work was another challenge．"I had to keep coming up with creative ways to adjust or change something," Mary admitted．"It took three months to build and another three months before it actually functioned properly．"

　　Mary competed with more than 1,700 other high school seniors in this year's science challenge．Forty finalists were invited to Washington, D．C．, where they presented their projects at the National Institute of Science．In all, 10 students took home awards for their innovative projects．

阅读下面短文，掌握其大意，然后从各题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　The old man went slowly into the restaurant．A young waitress named Mary 　　1　　 him go toward a table by the window．

　　Mary ran 　　2　　 to him, and said, “Here, Sir．Let me give you a 　　3　　 with that chair．”

　　She pulled the chair away from the table．Steadying(使平稳)him with one arm, she helped him move 　　4　　 the chair, and get 　　5　　 seated．Then she leaned his 　　6　　 against the table where he could reach it．In a 　　7　　, clear voice he said, “Thank you, Miss．And bless you for your kind 　　8　　．” “You're welcome, Sir．” She replied．“And my name is Mary．I'll be back in a moment, and if you need 　　9　　 , just wave at me!”

　　　　10　　 he had finished a hearty(丰盛的)meal of pancakes, bacon, and hot lemon tea, Mary 　　11　　 him the change．She helped him up from his chair, and out from behind the table．She handed 　　12　　 his walking stick, and 　　13　　 with him to the front door．

　　Holding the door 　　14　　 for him, she said, “Come back and see us, Sir!” He turned with his whole body, smiled, and nodded．“You are very kind．” he said softly．　　15　　 Mary went to clean his table, she was very 　　16　　．Under his plate she found a business card and a note．Under the note was a one-hundred-dollar bill．

　　The note 　　17　　：“Dear Mary, I respect you very much, and you 　　18　　 yourself too．It shows by the 　　19　　 you treat others．You have found the secret of happiness．Your kind gestures will shine through 　　20　　 meets you．”

　　The man she had waited on was the owner of the restaurant where she worked．This was the first time that she, or any of his employees had ever seen him in person．