B

Courtney was just 15 years old when she joined a team of space researchers.Those scientists landed NaSa's robot，Spirit，on the planet Mars.But this was neither Courtney's first nor her last adventure in space research.When she was in fifth grade，Courtney had already decided to spend her life"exploring the mysteries of the universe"．She checked out space books from her library，studied hard in math and science classes，and later，attended United States Space Camp in Alabama.

Then Courtney entered a contest to become part of the Student Astronaut program run by a group called the Planetary Society.After a lot of hard work，interviews，and months of waiting.Courtney found out that she was one of 16 students who made it-out of 500 entered.

Courtney and fellow student astronaut Rafael Morozowski，a 16­year­old from Brazil，were at the Jet Propulsion Laboratory in California with NASA scientists when Spirit reached Mars.

"The most exciting part of the thing occurred late at night on January 3,2004，when we received signals indicating that Spirit had landed successfully，"Courtney says."I joined the rest of the scientists in jumping up and cheering."

Courtney and Rafael spent seven nights working with and learning from the NASA scientists.(They worked at night because that was daying on Mars.)They studied the photographs that Spirit was sending to Earth of Gusev Crater on Mars.They spoke to television reporters at NASA press conferences and attended meetings in which the NASA team named the rocks and hills that Spirit was finding.

When Courtney was 17 years old，she went to work for NASA as a student intern at the Goddard Space Flight Center in Maryland.With two NASA scientists，Courtney plans to study astrophysics or planetary science at Princeton University，then return to work at NASA.She encourages other kids and teens to follow their dreams of getting involved with space research.

5．What can we learn about Courtney from Paragraph 1 and 2?

A．She was one of 16 students to be interviewed.

B．She landed on the planet Mars at the age of 15.

C．She entered the Student Astronaut program easily.