高中英语外研版 (2019)选择性必修 第四册Unit 5 Into the unknown精品课件ppt

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Pre-reading
Language pints
Fast reading
Intensive reading
Pst-reading
1. What different znes are there in the cean?2. Which parts f the cean d yu think have been explred?3. What d yu knw abut the deepest part f the cean?
Wrk in grups. Lk at the picture and answer the questins. D further research if necessary.
1. What different znes are there in the cean?
2. Which parts f the cean d yu think have been explred?
The different znes in the cean are Sunlight Zne, Twilight Zne, Midnight Zne and Abyssal Zne.（深海区）.
Sunlight Zne, Twilight Zne.
3. What d yu knw abut the deepest part f the cean?
The deepest part f the cean is Abyssal Zne. It is an area where the water depth is abut 2,000–5,000 metres. The trench can be lwered t 6,000 metres. These very deep areas are smetimes called “Super-abyssal znes”. Actually it is the largest eclgical regin n earth.
Mre than 500 years after it was lst in a strm, the Esmeralda was discvered ff the cast f Oman. The ship is believed t be part f a vyage led by Prtuguese explrer, Vasc da Gama during his secnd vyage t India (1502–1503).
Backgrund Infrmatin
Althugh the Esmeralda was first lcated in 1998, it was explred by marine archaelgists between 2013 and 2015. Researchers used advanced technlgy t examine sme f the bjects n the ship. Fr example, CT scanning was used t identify tw silver cins and a bell.
The Jialng, China’s manned deep-sea vessel, is named after a mythicalChinese sea dragn. At rughly 8.2 metres lng, 3 metres wide and 3.4metres high, it weighs almst 22 metric tns. In 2012, it set the recrd fr the deepest dive after reaching
a depth f 7,062 metres in the Pacific Ocean’s Mariana Trench. Thusands f metres beneath the waves, its crew tk incredible phts and vides and cllected imprtant samples frm the cean flr fr research in ceangraphy.
The Shenhai Yngshi, r Deep Sea Warrir, is China’s deep-sea submersible, which can reach a depth f 4,500 metres. The submersible tk 8 years and invlved ver 90 Chinese rganisatins and
cmpanies, with all f its cre parts being made in China. The Shenhai Yngshi has since been used t cmplete deep-sea diving missins in rder t cllect exact data n natural gas surces.
Read the passage and find ut what has been discvered in the cean depths.
Shipwrecks such as that f the Esmeralda, ruins f ancient cities like Neaplis, extrardinary deep-sea creatures such as bne-white cral and the barreleye, and the substance knwn as “fire ice” have been discvered in the cean depths.
What has been discvered in the cean depths?
Shipwrecks such as that f the Esmeralda.
Evidence:Para 1: Amng these is the Esmeralda, the earliestwreck frm the age f the Eurpean explratin fAsia.
Ruins f ancient cities like Neaplis.
Evidence:Para 2: One such find is the ancient Rman city fNeaplis, discvered ff the cast f Tunisia. Believedt have been buried underwater by a tsunami in thefurth century AD, the ruins f Neaplis are almst2,000 years ld.
Extrardinary deep-sea creatures such as bne-white cral and the barreleye.
Evidence: Para 3: Imagine bne-white cral 6,000 metres belw the cean’s surface, grwing at the rare f nly ne r tw millimetres per year. Swimming thrugh these black depths is the barreleye, a strange fish with eyes that can lk upwards thrugh its transparent frehead.
The substance knwn as “fire ice”.
Evidence:Para 4: Mst ntable f these is China’s discveryf an ice-like substance, knwn as “fire ice”, under the Suth China Sea.
Intensive reading
Think abut the structure f the passage and cmplete the diagram.
OVER THE CENTURIES: sailing acrss ceans t explre Earth’s furthest crners
Ocean explratin
MODERN AGE: explring 1___________
2______________ explratin Finding ancient ruins in 3_____________. Wrking t vercme challenges and make discveries at 4__________.Example: 5__________________
Archaelgical
shallw waters
vast depths
the ruins f Neaplis
6 __________explratin Cntaining abut 90 per cent f 7_______________. Helping cmprehend 8_______________________ ____________.Examples: 9_______________ 10_____________ 11_______________________________________ _________________
the planet’s fish
bne-white cral
the capacity fr life n ur planet
the barreleye
life t be fund even arund the deep-sea vlcanic penings
Discvery f natural resurces Discvering new natural resurces. Studying 12 __________. Identifying areas fr 13_______________.Examples: 14__________ 15_______________________
deep-sea drilling
the sea bed
China’s underwater vessels
1. Why d yu think the authr uses statistics in the passage?
The use f statistics makes the passage mre cnvincing.
2. What ther examples f cean explratin d yu knw f? Share ne with the class.
One pssible answer: ①On 10 Octber, 2020, Endeavur successfully cmpleted 13 dives in Mariana Trench, eight f which brke 10,000 metres. ②There is a grwing interest in the cnstructin f a netwrk f undersea bservatries, which is the mst effective means f early warning earthquake and tsunami.
3. What d yu think drives the explratin f the ceans?
One pssible answer: The ceans make up 70% f the earth’s ttal area. Large numbers f marine animals and plants are imprtant surces f fd fr human beings. Therefre, it is very imprtant fr us t understand the wrld’s ceans. In additin t cncerns abut maritime security and ecnmic interests, explratin f the seabed will satisfy human’s curisity and thirst fr the unknwn knwledge.
4. What cmmn message d the tw reading passages in this unit cnvey? Hw d they each build upn this idea?
Bth passages cnvey the message that humans have the desire and means t explre the unknwn. The first passage des this by lking at ur fascinatin with histry’s greatest mysteries, while the secnd passage lks at pineering explratin f Earth’s ceans.
Learning t learn
As yu read, ntice the discurse markers used in the text, eg in additin, als, hwever, furthermre, as well as. These markers functin like rad signs, helping yu cnnect ideas and understand the writer’s attitude and pinins.