1. (2018·青浦模拟) Questions are based on the following passage.

1. （1） In which aspects of brain can "interacting with nature" have improving effects?

   A . Memory and communication. B . Comprehension and concentration. C . Memory and concentration. D . Comprehension and communication.
3. （2） How long did the students walk in the research of Michigan University?

   A . 3 hours. B . An hour. C . 20 minutes. D . 50 minutes.
5. （3） What does the passage mainly talk about?

   A . Those who walk along city streets find themselves exhausted easily. B . A walk by a green route helps to improve city image to some extent. C . Taking a route with nature affects one's performance in a positive way. D . The volunteers' mental skills remain the same after walking in nature.