题目内容：

Bob was born in Cambridge. When he was in elementary school, he asked his mother to take him to parks in their community so he could collect empty soda cans to recycle. His mother agreed, as long as he saved part of the money he earned for college.

Bob’s mother remembers Bob as the most determined of her seven kids. Bob’s hard work paid off. On Friday, he will become the first person in his family, originally from El Salvador, to graduate from college. And he’s graduating with university honors.

For his honors thesis（毕业论文）he researched unmanned solar-powered（太阳能）airplanes, which BYU students have been building and testing for about 10 years. Bob’s study helps discover the best way to fly a solar-powered airplane so that it uses the least amount of power. The goal is to design and build an airplane that flies uncertainly. Bob’s thesis helps lay the basis for this work.

“My parents were always hard-working,” Bob said. “They often tell us hard work leads to success.” Bob’s father taught him to read at the age of 3, and his mother is now a student at Utah Valley University in a way to becoming a dentist.

Bob recognized he overcame some obstacles（障碍）to get where he is. For starters, English is his second language. He also faced stereotypes（模式化的形象）. Although Bob never doubted that he would be a college graduate, other people believed he wouldn’t because he didn’t come from a family of high income. There were other obstacles as well, but Bob viewed them all as opportunities.

Bob’s mother says she feels very happy and proud that her son is about to graduate with honors, and remembers the effort he’s made to get there. “He has worked very hard. He started something, and now he has finished it,” Cathy says. “I have always told him, ‘If this is your dream, then you can get it! Keep working hard and you can get it!’”

1.From the passage we can know that Bob’s honors thesis __________.

A. makes his mother feel surprised

B. helps to save the power of flying a solar-powered airplane

C. is done with BYU students

D. doubts the way of flying a solar-powered airplane

2.According to the passage, Bob          .

A. researched unmanned solar-powered airplanes for 10 years

B. paid for all his study by collecting empty soda cans

C. worked hard and has graduated from college

D. was affected by his family and has made some achievements

3.People thought Bob couldn’t graduate from college because _________.

A. his parents had little money to support him

B. his teacher didn’t think he could graduate

C. he didn’t work hard on his study

D. he didn’t dare to face the obstacles for short of confidence

4.It can be inferred that       .

A. Bob’s mother is on the way to becoming a dentist

B. Bob’s mother works in their community

C. Bon’s father will graduate from Utah Valley University on Friday

D. Bob’s father learnt to read at the age of 3