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1. 阅读理解
Limiting kids' recreational(消遣的) screen time to less
than two hours a day, along with enough sleep and physical activity, is associated
with improved cognition(认知), according to a study published
in The Lancet Child & Adolescent Health.
The study included about 4,500 US
children aged 8 to 11 and measured their habits against the Canadian 24-Hour Movement Guidelines for Children and Youth.
It found that 51% of the children got the recommended(建议) nine to eleven hours
of uninterrupted sleep per night, 37% met the recreational screen time limit of
two hours or less per day, while 18% met the physical activity recommendation of
at least 60 minutes of accumulated physical activity a day. Only 5% of the children
in the study met all three recommendations; 30% met none at all.
The researchers found that as each
recommendation was met by a participant, there was a positive association with global
cognition, which includes memory, attention, processing speed and language. Those
who met all three had the most "superior" global cognition, followed by
those meeting the sleep and screen time recommendation and finally the screen time
recommendation alone, according to the study.
Other organizations, such as the American
Academy of Pediatrics have guidelines in place to help with the management of children's
screen time. The organization suggests putting realistic rules or limits in place
for how long your children are on their screens, knowing who they are talking to
and what they are doing. The amount of recommended screen time depends on the age
of the child. Besides, parents should also make sure to encourage physical activity
and have bedroom rules such as creating "tech-free zones".
（1）Who are the target readers of this passage?
A . Researchers.
B . Teachers.
C . Parents.
D . Children.
（2）What is the main idea of this passage?
A . A study on children's screen time is published.
B . The US children fail to meet movement guidelines.
C . Organizations are concerned about children's cognition.
D . Limitation on children's screen time is linked to better cognition.
（3）According to the passage, which of the following might contribute least to cognition?
A . The screen time limit.
B . Sleep hours.
C . The physical activity time.
D . Sleep hours and the screen time limit.
（4）Why does the American organization suggest creating "tech-free zones"?
A . To make sure children have enough physical playtime.
B . To make sure children have enough sleep time.
C . To make sure children have recreational time.
D . To protect children against radiation.
