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Katherine Johnson whose life was described in the movie Hidden Figures died on February 24, 2020, aged 101. The 2016 movie describes a real story of a female African-American mathematician who joined the National Aeronautics and Space Administration(NASA) and led a mission to put the first man on the moon in the 1950s when racial discrimination was widespread.

"NASA is deeply saddened by the loss of a leader from our pioneering days," said NASA administrator Jim Bridenstine on the webpage of NASA. "Ms. Johnson helped our nation enlarge the frontiers (边界) of space and she also played an important role in opening doors for women and people of color to explore space. At NASA we will never forget her courage, leadership and the achievements we could not have reached without her. "

Johnson was born in West Virginia in 1918. She graduated from West Virginia State University as a mathematics major and became a teacher at a public school. She was also the first African-American woman to attend graduate school in mathematics at West Virginia University. But less than one year later, she left school to focus on raising children.

Her life changed in 1952 after a long career break. A relative told her about open positions at the all-black West Area Computing section at the National Advisory Committee for Aeronautics's Langley laboratory, and she began to work at Langley the next year. NASA depended on humans for complicated aerospace(航空航天) calculation as there was no high-functioning electronic computer. Female mathematicians usually took the job as their salary was lower. Johnson was one of those African-American human computers.

​Johnson was initially in charge of aerospace analysis and assigned to a space development mission launched in 1958. Then she worked for the 1961 suborbital (亚轨道的) flight of astronaut Alan Shepard and the 1962 orbital flight of John Glenn. Johnson continued to participate in missions after she retired in 1986. Her hidden achievements were finally publicized when former U.S. President Barack Obama granted her the Presidential Medal of Freedom in 2015 and her dramatic life was made into a movie.

1. （1） What did Bridenstine's words in the second paragraph mainly want to tell us?

   A . NASA's appreciation for Johnson's leadership. B . All Americans' regret at Johnson's death. C . Johnson's contributions to space exploration. D . NASA's achievements in space exploration.
3. （2） What can be inferred from the passage?

   A . Johnson used to work in a private school. B . Johnson worked in the aerospace industry for at least 33 years. C . Johnson starred in the movie Hidden Figures. D . Johnson was the first woman to attend graduate school in the U. S.
5. （3） Why did NASA depend on humans for complex aerospace calculation?

   A . It was cheaper to hire humans. B . The computers at that time weren't advanced enough. C . It couldn't afford to buy electronic computers. D . In terms of calculation, humans were more accurate than computers.
7. （4） What is the author's intention of writing this passage?

   A . To promote Hidden Figures. B . To highlight the greatness of women. C . To honor the great mathematician, Katherine Johnson. D . To tell readers about Johnson's lifetime achievements.