题目内容
16.Sometimes we wish that we could have more time.The good news is that this year will be longer than the previous!Although don't get excited just yet,because if you blink (眨眼),you may just miss it.That's because 2015 will be one second longer than 2014-also known as a leap second (闰秒).And surprisingly,they are pretty common.But why do we need them?
Over the centuries,Earth has been slowing down.This means that we must keep changing our clocks to keep in step with Earth's time.We've all heard of leap years.Our calendars hold 365 days in a year.Yet Earth takes slightly longer to orbit the sun.So we save this time and every 4 years we have an extra day in February.As for the leap seconds,the International Earth Rotation Service (IERS) manages the global time,known as the atomic time(原子钟时间).This is the timekeeping that's used for every single country.
To keep up with Earth's time,they add a second every now and then.They've been doing this since 1972.And this year will be the 26th second they've added!
You will have to stay up late if you want to experience it,though.It'll be added just before 8:00 a.m.on July 1Beijing time.So you will see 7:59:60 on July 1.
Although adding a second sounds harmless,it can have negative effects.In 2012 when a leap second was added,it caused problems for companies like social networking sitesReddit and LinkedIn.As they weren't prepared for the change,it caused their computers to record errors(错误).
61.2015will beB 2014.
A.as long as
B.a little longer than
C.a little shorter than
62.Why does a leap second have to be added in some years?C
A.Because we need to have more time.
B.Because it can help make a leap year.
C.Because the earth is slowing down.
63.What does orbit in the third paragraph mean?A
A.绕…而行
B.远离
C.超过
64.In a leap year,there is an extra day inB.
A.January
B.February
C.March
65.What's the negative effect of adding a leap second?C
A.It makes the day longer that the previous one.
B.It does harm to people's health.
C.It causes some recording errors for companies.
分析 文章讲述了闰秒和闰年的概念及这种做法的原因.同样也描述了闰秒对人们生活的负面影响.
解答 (C)61--65 BCABC
61.B根据文中第二段原句That's because 2015 will be one second longer than 2014-also known as a leap second (闰秒).可知2015年比2014年多了一秒.故选B.
62.C根据文中第三段的描述,可知在一些年份中添加闰秒的原因是因为地球自转的速度在变慢,为了时间的正确性,所以需要添加闰秒.故选C.
63.A根据文中第三段的原句Yet Earth takes slightly longer to orbit the sun.结合生活常识可知地球在围绕太阳慢慢的公转,故orbit的意思应该是A.
64.B根据文中第三段的原句So we save this time and every 4 years we have an extra day in February.并结合生活常识,可知在闰年时,2月会多出一天.故选B.
65.C根据文中最后一段原句In 2012 when a leap second was added,it caused problems for companies like social networking sitesReddit and LinkedIn.As they weren't prepared for the change,it caused their computers to record errors(错误).可知闰秒的负面影响是导致一些公司的记录错误.故选C
点评 本文是一篇科普文,闰年闰秒的概念考生生活中也有一定理解,可以结合生活经验答题.阅读理解题,需要先读题,理解清楚题目意思,接着带着问题去文章中寻找、推断答案.把握好细节,注意推敲才能保证正确率.