7、 “In real life, the daily struggles between parents and children are about these small problems of an extra hour of sleep or extra hour of TV show, and so on” said Avi Sadeh, psychology（心理學）professor at Tel Aviv University. Sadeh and his colleagues found an extra hour of sleep can make a big difference. The children who slept longer, although they woke up more frequently during the night, scored higher on tests, Sadeh reported in the March/April issue of journal Child Development.

       “Some studies suggested that lack of sleep as a child affects development into adulthood and it is more likely to develop their attention disorder when they grow older. ” Sedeh said.

       In earlier studies, Sadeh’s team found that fourth graders slept an average of 8. 2 hours and sixth graders slept an average of 7. 7 hours.

       “Previous research has shown children in elementary school need at least nine hours of sleep a night on a regular basis, said Carl Hunt, director of the National Center on Sleep Disorders Research in Bethesda, “and high-school-age children need somewhat less,” he said, adding that the results of insufficient（不足） sleep could be serious.

       “This is an important further discovery of what we already know, ” Hunt said of Sadeh’s research, adding that sleep is as important as nutrition and exercise to good health.

       “To put it into reality,” Hunt said, “parents should make sure they know when their children actually are going to sleep and their rooms are conducive to sleeping instead of to playing.”

1．What is Child Development?

       A．A new story.                                       B．A popular book.

       C．A periodical magazine.                          D．A TV programme.

2．How many persons are exactly mentioned in the text?

       A．One.                   B．Two.                   C．Three.                 D．Four.

3．The underlined phrase “conducive to” （in the last sentence） means ________.

       A．helping sth. to happen                          B．influenced by

       C．full of                                                 D．a(chǎn)cceptable of

4．Which of the following statements is NOT true according to the passage?

       A．There are daily struggles between parents and children because of different ideas about sleep time.

       B．The children who sleep longer are weak in their study.

       C．Lack of sleep as a child has great effect on their development into adulthood.

       D．In general, children in elementary school need at least nine hours of sleep a night.