Have you ever paid attention to your school's security guards（保安人員）or dining hall staff？Would you say "good morning" to your school's cleaners？For high school student Ding Jiacheng，it's a problem that many students couldn't notice the important jobs done by these non-teaching workers.He wanted to make a change.
   The boy from Hangzhou Entel Foreign Language School，together with several other students，worked on a project called "the Invisible（隱身的）are Important".They hoped more students would see and respect（尊重）the "invisible" staff in school.The project won a prize at China Thinks Big，a competition held by Harvard University and Tsinghua University to encourage teenagers to study social problems.
   "My team members and I sent questionnaires（問卷）to 158 students，" said Ding. "In one question，56 percent of the students said they would greet those non-teaching workers，while only 17 percent strongly believe that every student should do so."
   The team also studied interactions（互動）between students and workers. "When most students follow the rules of their teachers，one-third of the students go against the rules of the cleaning staff，" said Ding. "It shows that students treat non-teaching staff differently from teaching staff."
   The main reason，according to Ding，is that students know little about the work done by non-teaching staff.They also have few chances to communicate with them.
   Therefore，Ding's team shot videos to show staff working around school.They also held a basketball match between students and non-teaching staff to increase their interaction.
   "We've also drawn a series of cute pictures，" said Ding. "We hope these cute images will help young people like the non-teaching staff more."
   "The activity helped me understand that we can all make a difference through our creative ideas，" Ding said.

（1）Why did Ding Jiacheng and his teammates start the project "The Invisible are Important"？

C

C

A．To win a prize at the competition China Thinks Big.
B．To help non-teaching staff at his school find other jobs.
C．To let more students see and respect non-teaching workers.
D．To draw students' attention to important social problems.
（2）What are Paragraphs 3—4 mainly about？

C

C

A．What jobs non-teaching workers do.
B．How asking questions helps students learn.
C．How Ding's team worked on their project.
D．Why many students don't follow school rules.
（3）According to the passage，what did Ding's team do to help other students know more about the non-teaching staff in their school？

D

D

a.They made posters.
b.They shot videos.
c.They drew a series of pictures.
d.They held a basketball match.
A．a(chǎn)bc
B．a(chǎn)bd
C．a(chǎn)cd
D．bcd