Information is received into our brain by attention, and its quality determines (决定) how well it will be processed, saved and used afterwards.
All information we receive is chosen by our attention. Factors (因素) affecting (影响) our attention are personal interest, experience, ability, feelings, knowledge, environment, timing, and so on. The same information may attract different forms and levels of attention from different people. Some people can get and save the information easily; some may have great difficulty; while others may just turn a blind eye to it. To the same information, one may even pay different levels of attention at different times. But if the facts work together, the quality of attention may be better. Therefore, it is not surprising to see that somebody with average intelligence (智力) can have excellent performances in some fields.
The good news is that a person's attention can be shaped, trained and made stronger by effective exercise. With this in mind, we should keep improving the quality of our attention.
"it" in Paragraph 1 means _______.

A．information

B．brain

C．attention

D．quality

All information we receive depends on _______.

A．information itself	B．our attention
C．our intelligence	D．the environment

Which is not the factor that affects our attention according to the passage?

A．Interest and experience.

B．Experience and knowledge.

C．Ability and feelings.

D．Food and drinks.

About attention, which of the following statements is right?

A．People always have the same level of attention.

B．People pay the same attention to the same information.

C．A person may pay different levels of attention to the same information at different times.

D．All factors affecting attention never work together.

According to the passage, _______ can help people to make their attention better.

A．speaking more	B．effective exercise
C．hard work	D．high intelligence