外研版（2019）选择性必修第一册 Unit 5 Revealing nature-Starting out课件（共11张PPT)

(共11张PPT)
Revealing Nature
Komodo dragon:(科莫多巨晰）
Komodo dragons were first encountered by Western researchers in 1910. The researchers said the ancestor of the Komodo dragon most likely evolved in Australia and spread westward, reaching the Indonesian island of Flores 900,000 years ago.
The Komodo dragon is the largest lizard in the world. It can grow to three metres in length and can weigh about 135 kilograms. Despite its size and weight, it can run for short distances at up to 20 kilometres per hour.
Duck-billed platypus（鸭嘴兽）
The first scientists to examine a preserved platypus body judged it a fake in the late 18th century. The oldest discovered fossil of the modern platypus dates back to about 100,000 years ago.
The duck-billed platypus is a small egg-laying mammal (up to 60 cm in length) found only in Eastern Australia including Tasmania. As its name suggests, it has a mouth that looks like a duck`s bill, while its thick fur and flat tail are similar to those of a beaver（海狸）.
Nautilus（鹦鹉螺）
Fossil records indicate that the nautilus has survived relatively unchanged for around 500 million years. That is why it is often given the name “living fossil.”
1. What do you know about these animals What makes them special
They are all species that exit _____________ _______years on earth; They are __________ and ___________
2. What other similar animals do you know about
Share your knowledge with the class.
thousands
of
old
rare/unusual
How seeds travel
V 传播，移动
How can seeds travel
Seeds cane travel great distances by being carried by the _________ , upon the ____________, __________ or __________.
wind
water
animals
people
2. How can this benefit plants
Seeds have a __________(better/worse) chance at life when they are ________(closer/further) away from their parent plant. Growing too _________(far/close)to the parent plant means seeds might not get enough_______, ________and nutrients from the _______. A species is ________(more/less) likely to _________ if its members are more ________(closely/widely) spread.
better
further
close
sun
water
soil
more
survive
widely
Example Carried by Feature How
Maple seeds Wings that _______ and keep them in the ______ for ______, allowing them to ________ in all kinds of places Depending on the _______ of the wind, they can sometimes travel for _________ ____ kilometers
Coconuts Its ________ shell allows it to _______ on the water for a long time. When a coconut _______from a tree onto the beach, the sea _______ it ______ and carries it away to _______somewhere else
Cherry Many plants ________ fleshy fruits that animals like to ________ Animals _______especially ________, so the seeds can easily end up a _______way from the parent plant.
Example Carried by Feature How
Maple seeds Wings that _______ and keep them in the ______ for ______, allowing them to ________ in all kinds of places Depending on the __________ of the wind, they can sometimes travel for ___________ ____ kilometers
Coconuts Its ________ shell allows it to _______ on the water for a long time. When a coconut _______from a tree onto the beach, the sea _______ it ______ and carries it away to _______somewhere else
Cherry Many plants ________ fleshy fruits that animals like to ________ Animals _______especially ________, so the seeds can easily end up a _______way from the parent plant.
wind
ocean
currents
animals
spin
air
longer
land
strength
hundreds
of
hard
float
falls
picks
up
grow
produce
eat
move
birds
long