In recent years，American students have fallen behind in many subjects like math，science and reading. In 2005，the U.S. 
was number nine among the developed countries in the number of students graduating from high school.
American education officials are searching for new ways to help students learn again. One tool that is getting some attention is the use of video games.
Sixteenyearold John Diaz says he loves playing video games but doesn't like traditional schoolwork. During his summer vacation，Diaz is continuing his studies at home. That is because his courses are available on his home computer.
Florida Virtual School's head master，Julie Young，says the school teaches students with the technology they most enjoy using in and out of school.“We have so many students who feel free in our school，” Young said, “They lose interest when they go to school. And we're very hopeful that Conspiracy Code will attract the learners to really get into the detail of learning.”
Conspiracy Code is a video game that teaches U.S. history. Students guide two heroes in a quest to stop a conspiracy to change the past. Along the way，students learn about events such as the Civil War，and report back to their teacher who is a spy ．
John Diaz says he enjoys American history now.“I like to do the game every day，” he said.
30．In the first paragraph，we can learn that American students________.
A．do better in science than reading
B．do not want to go to college
C．have been less interested in studies recently
D．do worst in math among the developed countries
31．How does John Diaz continue to study in su
mmer vacation?
A．By having an experienced tutor.
B．By going to a vacation camp.
C．By studying on the computer.
D．By watching videos.
32．Conspiracy Code is a video game that________.
A．introduces the ways of finding a spy
B．teaches students American history
C．helps students learn computers
D．trains people to become
heroes
33．What is the text mainly about?
A．Video games becoming new teaching tools.
B．How Conspiracy Code helps students study.
C．How Florida Virtual School teaches students.
D．American officials caring about education.