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初一教案 第739期(2)
发布时间:2021-05-24

本期配套教案共2页:  1  2

41/ 739期初一教案

Wave of bugs is coming (p6)

While reading

Can you imagine waking up one day after sleeping for 17 years? Thats what 30 billion of cicadas () will do this summer in many parts of the US.

 

imagine v. /ɪˈmædʒɪn/  想象;设想  

imagine sth/ doing sth/ that

imagination n.想象力

 e.g. Use your imagination!

    I don't imagine (that) they'll refuse.

    我认为他们不会拒绝.

billion     num.   /ˈbɪljən/  十亿

billions of  数以十亿记的

数字+billion of    3 billion of  30亿的....

million 百万    one in million  凤毛麟角

thousand

hundred 

one in hundred  百里挑一

 

Cicadas are common insects (昆虫). They spend most of the year hiding underground.

spend  v./spend/ 花费

spend time (in) doing sth

spend money on (doing) sth

She spent $100 _____ a new dress.

 

Cicadas are common insects (昆虫). They spend most of the year hiding underground.

“花费”大杂烩

  pay 付钱,主语为人,用于pay money for sth

  spend 支付,主语为人,用于spend money on sth

  cost 花费,主语为物,sth costs sb some money

  take 花费(时间),主语为itit takes sb time to do

 

...But there are other cicadas who stay hidden for longer.

stay v. /steɪ/  vi. 停留;坚持;暂住;停下

stay hidden 藏起来   e.g. I can stay hidden in the crowd (人群).

stay unchanged 保持不变  stay unfinished  仍旧未完成

stay healthy  保持健康

stay green   持绿性    

e.g.  The leaves might stay green during winter.

 

They’re one of the longest-living insects.

How to translate this sentence?

他们是生存时间最长的昆虫之一。

longest-living  adj.生存最长久的

复合形容词:a.单词之间要有连字符;

                      b. 复合形容词中的名词用原形;

                      c.  复合形容词一般用作前置定语

two-hour (两小时的)three-year-old (三岁的)

     two-faced (两面的) part-time(业余的)

 

They’ll come out when the temperature outside reaches 17.7 C.

When they come out, some people’s backyards will look like the ocean, moving up and down with “waves” of bugs.

 

come out

出来

出现

发表

开花

 

reach  v./riːtʃ/达到;延伸;伸出手;传开

reach for伸手去拿

reach out 伸出

within easy reach of 再容易达到...的地方

 

They’ll come out when the temperature outside reaches 17.7 C.

When they come out, some people’s backyards will look like the ocean, moving up and down with “waves” of bugs.

 

move up and down 扑腾,跳动

day and night =days and nights 昼夜,终日终夜

day in and day out 天天

ups and downs  挫折,起伏

 

wave v./weɪv/ 挥手;挥手示意;挥舞

           n. 海浪,海潮;涌现的人或物

waves of 一波又一波的

wave goodbye to sb 向某人挥手再见

wave down 示意停下

 

The underlined sentence tells us that there will be a  ________ number of cicadas when the weather gets warm.

 

After they come out, they will lose their exoskeletons (外骨骼). The exoskeletons will break up and go into the dirt. They will help plants grow.

 

What does break up mean here?

 

break up 打碎,破碎;结束;解散,分手;衰落

break down破坏, 毁掉; 破除;

break into破门而入

break the law/rule违反法律/规章制度

break ones heart使某人心碎

 

But cicadas arent dangerous to us. They cant hurt humans. After they come out, they will lose their exoskeletons (外骨骼). The exoskeletons will break up and go into the dirt. They will help plants grow.

 

Are periodical cicadas harmful to us?

What benefit do they bring?

 

 

 

本期配套教案共2页:  1  2

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