【題目】閱讀下列短文，從每題所給的四個(gè)選項(xiàng)（A、B、C、D）中，選出最佳選項(xiàng)。

It’s a time when school，homework，active social lives and pare-time jobs keep teenagers busy from early in the morning until late at night．They are likely to try to make up for a lack of sleep by “sleeping in” on the weekends．Unfortunately，this causes irregular sleep and actually makes the problem worse．

Most teenagers are not able to fall asleep until late at night．Since many teens aren’t sleepy until around 11 pm．but need to be at school by 7:30 or 8:00 am ．They cannot get enough sleep ．During puberty(青春期)，the biological clock in the brain naturally re-sets to a later time ，and this causes teens to fall asleep later．Then ，when it’s time to get up ，a teen’s body clock is likely to still be producing the night-time hormones ．This makes it hard for them to feel active and energetic in the morning．

A growing body of research suggests that starting high school later improves attendance，achievements and grades．A few years ago in an important study ，test scores on the SAT college entrance exams in Edina，Minnesota jumped more than 100 points on average，when the morning school bell rang an hour later．Unfortunately，most schools are not set up to start later and fail to satisfy teen’s sleep needs．

【1】What effect does “sleeping in” on the weekends have on teenagers?

A．Improving their health

B．Weakening their energy

C．Disturbing their biological clock

D．Making up for their hormone loss

【2】The study in Minnesota shows that starting morning school one hour later helps to______．

A．make teenagers grow faster

B．change teenagers’ sleep needs

C．do more research on teenagers

D．improve students’ achievements

【3】The text helps us to know more about teenagers’______．

A．daytime activities B．sleeping habits

C．mental problems D．studying methods

【答案】

【1】C

【2】D

【3】B

【解析】

試題分析：

【1】推理判斷。根據(jù)第一段最后一句Unfortunately，this causes irregular sleep and actually makes the problem worse，可知此與C選項(xiàng)的描述相符，應(yīng)選C。

【2】2．細(xì)節(jié)理解，根據(jù)第三段中的A few years ago in an important study ，test scores on the SAT college entrance exams in Edina，Minnesota jumped more than 100 points on average，when the morning school bell rang an hour later，可知早上上課的時(shí)間推遲了，學(xué)生有更多的時(shí)間睡眠，因而他們的學(xué)習(xí)成績有所提高，故選D。

【3】主旨大意，縱觀全文，由文章的大意可知本文主要探討的是學(xué)生的睡眠是否足夠，學(xué)生的睡眠與他們的學(xué)習(xí)成績的是否有影響。結(jié)合各個(gè)選項(xiàng)的意思，可知B選項(xiàng)的內(nèi)容與之相符，故選B。

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