16.Using a mobile phone before going to bed can damage your health,according to a major study.
It says that radiation from the mobile phone can cause insomnia(失眠癥) and headaches as well as cutting the time spent in deep sleep.Failing to get enough sleep can lead to depression,lack of concentration and personality changes.In teenagers and young children,lack of sleep can result in attention disorders and poor grades.
The research showed that using mobile phones before bed causes people to take longer to reach the deeper stages of sleep and to spend less time in them.
Deep sleep is important as it is the time when the body rejuvenates(更新) cells and repairs damage suffered during the day.Scientists found that using mobile phones an hour before sleep affects it.In the study scientists examined the sleep patterns of 36women and 35men aged 18to 45.Some were exposed to radiation that is similar to what a person receives when using a mobile phone.The others received none.The results are as follows:The first group took longer to enter the first of the deeper stages of sleep and spent less time in the deepest one.However,the second group was opposite.
The findings will shock many parents.Many parents are always worried about their children's health.But they didn't have a better way to persuade them not to use a mobile phone.
28.The passage mainly tells us aboutB.
A.deep sleep is good for your health
B.using a mobile phone before sleep can damage your health
C.different people have different sleep patterns
D.long sleep can renew cells
29.The underlined word"it"refers toC.
A.people's body  
B.a(chǎn) sleep pattern   
C.deep sleep       
D.a(chǎn) day
30.Which of the following is NOT mentioned in the passage?C
A.Deep sleep is a good time for the body to repair damage suffered during the day
B.The study examined the sleep patterns of about 70people.
C.The findings shocked many teachers and teenagers.
D.Using mobile phones before bed causes people to take longer time to enter the deep sleep.
31.We can infer from the passage thatA.
A.many children use mobile phones before sleep
B.radiation from the mobile phone can cause parents'worries
C.the lack of sleep can lead to children's excitement
D.using a mobile phone before sleep doesn't harm the aged.

分析 本文主要講述了睡覺前使用手機對人的身體有極大的壞處,并描述了其原因.

解答 28.B 歸納題.根據(jù)文章內(nèi)容尤其是主題段Using a mobile phone before going to bed can damage your health,according to a major study.一項調(diào)查研究顯示:睡覺前使用手機是會對身體造成損壞的,后文對該話題進行了詳細的描述,結合選項,故選B
29.C 詞義猜測題.根據(jù)文章內(nèi)容,Deep sleep is important as it is the time when the body rejuvenates(更新) cells and repairs damage suffered during the day.Scientists found that using mobile phones an hour before sleep affects it.科學家說;深度睡眠是非常重要的,因為在那期間身體要更新細胞并且修復白天受損的身體.但是,睡覺前使用手機會對深度睡眠有影響,結合選項,故it指代的應是deep sleep 
30.C 細節(jié)題.根據(jù)文章內(nèi)容,The findings will shock many parents.研究結果使得很多家長吃驚,而不是老師和家長,結合選項,故選C
31.A 推理題.根據(jù)文章內(nèi)容,Many parents are always worried about their children's health.But they didn't have a better way to persuade them not to use a mobile phone.家長們擔心孩子的健康問題,但是又找不到更好的方法勸他們少用手機,由此可知,現(xiàn)在的孩子常在睡覺前用手機,故選A

點評 本文是一個科教類閱讀,題目涉及多道細節(jié)理解題,做題時結合原文和題目有針對性的找出相關語句進行仔細分析,結合選項選出正確答案.推理判斷題也是要在抓住關鍵句子的基礎上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù).

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