Now we are used to enjoying the convenience brought by different kinds of new apps. In fact, it is really difficult for people to create apps. The creators often need lots of knowledge. But some middle school students are making their own apps. It may be unbelievable, but it has truly taken place somewhere so far. Last year, there was an app competition for middle school students in Beijing, China. A group of competitors around China took part in it to show their inventions.

Lu Yichao, a student from Sichuan, invented an app. It is called Health Helper. His app is really helpful. It tells people when and where to do exercise every day. It can tell people to exercise on time when the smartphones ring.

Another student, Li Haochen, invented an app that could test PM2.5. In this way, people can know whether the air is bad or not by using their mobile phones before going out. “It is impossible to make an app without hard work. I have to be really careful and try again and again patiently to make the app work well. But every time I make an app successfully, I become much more interested in inventing some other ones. It has been one part of my life. Creating apps makes a big difference to my life.” he said when the reporter interviewed him.

Many engineers from big companies get interested in these great apps from the students and decide to spread their usage in different fields. They believe these apps are of great use and will certainly get popular around China, even the world in the near future.

【小题1】Who took part in the app competition?

A．Some middle school students around China.	B．Some engineers around the world.
C．Some middle school students across the world.	D．Some engineers from big companies.

【小题2】Lu Yichao’s app can ________.

A．show people how to exercise	B．tell people when to go out
C．teach people to test PM2.5	D．remind people to exercise

【小题3】What can we know from Li Haochen’s words?

A．Making an app requires hard work.	B．He has little trouble inventing apps.
C．Creating apps hardly influences his life.	D．He seldom succeeds in making an app.

【小题4】What can be inferred (推断) from the last paragraph?

A．Creating apps will get popular around the world.

B．The students’ apps will be used in different fields.

C．Big companies have spread the usage of those apps.

D．Many engineers have invented great apps for students.