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初二教案 第781期(2)
发布时间:2022-06-20

本期配套教案共2页:  1  2

45/781期初二教案

作者:张璨

 

Life-changing find (P6)

Pre-reading

Are there aliens in the universe?

Do you know how life began on Earth?

 

While reading

 Have you ever wondered how life began on Earth? Are there aliens in the universe? A new discovery may give you some clues!

    In 2020, Japanese space probe (探测器) Hayabusa 2 brought back 5.4 grams of sand from Ryugu, a near-Earth asteroid (小行星). Recently, scientists found over 20 types of amino acids (氨基酸) in the sand. This is the first time that amino acids have been found outside Earth.

clues[kluːz]: n.线索,端倪,蛛丝马迹(clue 的复数)

recently[ˈriːs(ə)ntli]: adv.最近,近来,不久前

翻译:一项新发现可能会给你一些线索。

最近,科学家在沙子里发现了超过20种氨基酸。

练习:警察在那一地带查找线索。The police searched the area for clues.

最近我的体重增加了。I've gained weight recently.

 

    What does that mean? Amino acids are key to life. They are the building blocks of proteins (蛋白质). Proteins form our bodiesorgans (器官) and help us live. This finding shows that dust from asteroids, such as the Ryugu, may have brought seeds of life to Earth billions of years ago, according to Japanese professor Hisayoshi Yurimoto at Hokkaido University. It also means that life could have been born in more places in the universe than previously (之前) thought,professor Kensei Kobayashi at Yokohama National University told Kyodo News.

mean[miːn ]: v.意味着,表示……的意思 seeds[si:dz]: n.种子

翻译:那意味着什么呢?这一发现表明,来自小行星(如龙宫)的尘埃可能在数十亿年前给地球带来了生命的种子。

练习:这个句子是什么意思?What does this sentence mean?

这些种子几天后就会发芽。The seeds will sprout in a few days.

 

  Previously, people have found amino acids in meteorites (陨石) space rocks that have fallen to Earth. But they could have been contaminated (污染) by living things on the ground. Hayabusa 2 is groundbreaking because it sent the sand to Earth without letting it touch the outside air, reported Kyodo News.

touch[tʌtʃ]: v.接触,触摸,触及,碰

翻译:据日本共同社报道,隼鸟2号是开创性的,因为它在不接触外界空气的情况下将沙子送到了地球。

练习:没有必要直接与这些元素接触。

There is no real need to touch these elements.

 

    Hayabusa 2, launched in 2014, aimed to work out the origin   (起源) of the solar system (太阳系) and life. NASA has a similar mission. It sent a probe to an asteroid named Bennu. The probe has already collected samples and is going to return to Earth next year.

By comparing the samples from Ryugu and Bennu, scientists will better understand the chemicals (化学物质) in the universe and how life began, according to Science and Technology Daily.

similar [ˈsɪmələ]: adj.类似的,相似的,相像的

by comparing 通过对比,通过比较

翻译:美国国家航空航天局也有类似的任务。NASA (National Aeronautics and Space Administration)据《科技日报》报道,通过对比龙宫和贝努的样品,科学家将更好地理解宇宙中的化学物质和生命的起源。

练习:他们有着相似的嗓音。They have similar voices.

 

Post-reading

Search for more information about Hayabusa 2. Discuss with your partners and make a report.

 

Practice

Choose the answer:

1. According to Paragraph 2, where did scientists find the amino acids?

A. In the buildings on Ryugu.   

B. In a Japanese space probe.

C. In plant seeds from the Ryugu.

D. In sand from a near-Earth asteroid.

 

2. What can the finding tell us, according to the passage?

A. Life on Earth came from Ryugu.

B. There was life on Ryugu billions of years ago.

C. There might be more places with life in the universe.

D. Life could be found in most of the asteroids in the universe.

 

3. How can the scientists be sure that the sand from Ryugu wasnt contaminated by living things on Earth?

A. It was sent to Earth in a spaceship.

B. It didnt have contact with the outside air.

C. It was taken from the inner part of the meteorite.

D. It was kept inside a special space rock.

 

4. What do we know about NASAs mission?

A. It will send a probe to an asteroid next year.

B. It will study samples from Bennu.

C. It will send its samples from Bennu to Japan.

D. It will use Hayabusa 2 to collect samples from other asteroids.

 

5. What is the passage mainly about?

A. How amino acids work in space.

B. Japans plans to explore the universe.

C. The finding of amino acids outside Earth.

D. Samples from different asteroids.

 

完成句子。

clues; recently; mean; seeds; touch; similar; by comparing

1. The brothers look very _____.
2. What do these  ____  ____ ?

3. The ____ are dispersed by the wind.

4. Don't ____ it! It's hot.

5. Prices have gone down _____.

6. _________ photos of rotting fish to fossils, researchers can guess what the extinct creature looked like.

 

参考答案:

1. 本题为细节理解题。对于Where的回答,根据提示,到第二段定位关键词amino acids,由Recently, scientists found over 20 types of amino acids (氨基酸) in the sand.得知,科学家在沙子里发现了氨基酸,固答案为D选项。

2. 本题为逻辑推理题。这项发现告诉我们什么?由原文可知,小行星的氨基酸可以传播到其它星球,为生命的诞生创造条件,所以宇宙中可能有多处地方存在生命。因此答案为C。并不能推出A.地球上的生命来自龙宫;B.数十亿年前Ryugu上有生命(只是把生命的诞生条件之一——氨基酸传播到了地球上);D.在宇宙中的大多数小行星上都能发现生命。因此排除这三项。

3. 本题为逻辑推理及词义理解题。由Hayabusa 2 sent the sand to Earth without letting it touch the outside air.得出,科学家们能确定沙子没有被地球上的生物污染,是因为它没有接触外界空气。此处的touchBcontact with的意思都是接触,固答案为B

4. 本题为逻辑推理题。NASA的任务是探索太阳系和生命的起源,它发射的探测器已经从小行星贝努上收集到样本,并将于明年返回地球,可以推测出科学家将研究该样品,并与龙宫的样品进行对比,因此选B

5. 本题为主旨大意题。根据标题Life-changing find《地球外首次发现“生命之源”氨基酸》及第二段This is the first time that amino acids have been found outside Earth.可以推出,本文的主题为C

 

完成句子。

1. similar   2. clues mean  3. seeds   4. touch   5. recently   6. By comparing

本期配套教案共2页:  1  2

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