题目内容：

    Only 48% of school age children in the United States get 9 hours of sleep most weeknights, according to a new research being presented at the American Academy of Pediatrics ( AAP) 2019 National Conference & Exhibition in New Orleans. An abstract of the study, "Sounding the Alarm on the Importance of Sleep” , will be presented on Saturday, Oct. 26, at the Ernest N. Morial Convention Center in New Orleans.

“Long-term sleep loss is a serious public health problem among children,” said abstract author Hoi See Tsao, MD, FAAP. "Insufficient sleep among adolescent, for example, is associated with physical and mental health consequences including increased risk of depression and obesity and negative effects on mood, attention and academic performance.”

Dr. Tsao said, "Our research shows that children who get enough sleep are more likely to flourish(健康成长)in comparison to children with insufficient sleep."

Researchers analyzed responses from parents and caregivers of 49,050 children ranging in age from 6-17 years old in the combined 2016-2017 National Survey of Children's Health. They answered questions on how many hours of sleep a randomly selected child in their household slept on an average weeknight. For the study, sufficient sleep was defined as sleeping greater than or equal to 9 hours on an average weeknight.

The researchers found that sufficient sleep, was positively associated with several individual flourishing markers, as well as the combined childhood flourishing measure. The researchers also identified risk factors associated with insufficient sleep, which included lower levels of parental or caregiver education, the presence of mental health conditions and so on.

Dr. Tsao said the study strengthened the importance of increasing efforts to help children get the recommended amount of sleep for their age. “Interventions like these may help children demonstrate more measures of childhood flourishing, enhance their development and give them brighter futures, " she said.

1.What does the second paragraph mainly talk about?

A.The harm of long-term lack of sleep.

B.The cause of long-term lack of sleep.

C.The way to improve sleep quality.

D.The advice against sleep loss.

2.Who were questioned in the study according to the passage?

A.Children and parents. B.Researchers and caregivers.

C.Parents and researchers. D.Parents and caregivers.

3.What can we know from the last paragraph?

A.Dr.Tsao denies the efforts

B.Dr. Tsao thinks highly the study.

C.New interventions can help children sleep

D.New interventions are of little importance.

4.Where can we most probably read this test?  .

A.In a science report. B.In a personal diary

C.In a travel magazine. D.In a geography textbook.