英語(yǔ)必修4-unit2 Using language-寫(xiě)作拓展課件

??1．chemical

adj

化學(xué)的→n.

化學(xué)

chemistrychemical

fertilizer---

chemical

farming2．production

n

生產(chǎn)，制造→n

.產(chǎn)品product→v.

生產(chǎn)produce建立，成立3．long-term

長(zhǎng)期的4

.

bacteria

細(xì)菌

5.增強(qiáng)pest

害蟲(chóng)培養(yǎng)6 build

up導(dǎo)致

通向（往）7 lead

to

營(yíng)養(yǎng)，滋養(yǎng)物89nutrition

礦物質(zhì)mineral

化學(xué)肥料 化學(xué)耕作11focussoilreduce14

root10

discovery

n.發(fā)現(xiàn)；發(fā)覺(jué)n.焦點(diǎn)；中心點(diǎn)vt.集中；聚焦focus...onn.土壤vt.減少；減縮

reduce

to/byn.根；根源Words

previewchemical

or

organic

farming?Using

Languagelet's

look

at

the

title

and

picture

on

the

book.predictWhat

is

chemical

farmingWhat

is

organic

farming?Make

achoice----whichonetochoosechemical

or

organic

farming?Ways to

farmChemical

Or

OrganicFarming?ReadingMatch

the

following

headings(標(biāo)題)to

eachparagraph.Para1A.

Other

methods

to

keep

the

soilfertile.Para2B.

Farmers

and

customers

turn

toorganic

farming.Para3C.

Problems

caused

by

chemicalfertilizers.Para4D.

Chemical

fertilizers

can

causedamage

to

the

land

and

people's

healthFast

readingWhy

are

chemical

fertilizers

so

popularin

farming

today?What

problems

can

be

caused

byusingchemical

fertilizers?What

is

organicfarming?What

is

the

main

reason

for

usingorganic

farming

methods?Read

the

passage

and

answer

thefollowing

questions.1

Why are

chemical

fertilizerssopopular

in

farming

today?They

are

a

great

way

to

stop

cropdisease

and

increase

production.chemical farming----

what

does

chemical

mean?pesticidesfertilizersThe

advantages

of

chemical

farming

food1

They

look

pretty good---good

look.2

They

grow

very fast---big

size3A

high output(產(chǎn)量)4

.....Do

you

think

the

food

aredelicious?Are

they

good

for

our

health?.......A..however...B.....advantage

disadvantge2

What

problems

can

be

caused

byusing

chemical

fertilizers?be

full

of

much

nurtrition.In

addition,...1,They

damage

the

land

by

killing

helpfulbacteria

and

pets

as

well

as

harmful

ones2,

They

also

stay

in

the

ground

and

First,

...underground

water

for

a

long

time.

thisaffect

crops,

animals

and

humans.

also,...3,

Fruit,

vegetables

and

other

foodgrownwith

chemical

fertilizers

grow

too

fast

to2

What

problems

can

be

caused

byusing

chemical

fertilizers?一問(wèn)一答總－分（first

......in

addition）First,

...also,

...In

addition,...Organic

farming

means

growing

cropswithout

using

any

chemicals.4

What

is

the

main

reason

for

usingorganic

farming

methods?The

main

reason

for

usingorganicfarming

methods

is

to

grow

good

foodand

to

avoid

damaging

theenvironmentor

people’shealth.bydefinition3

What

is

organic

farming?Which

one

doesn't

belong

toorganicfarming

methods?use

pesticides

to

reduce

disease

and

pests.change

the

kind

of

crop

in

each

field

.plant

crops

to

usedifferentlevels

ofsoil.plant

grass

between

crops

to

prevent

windor

water

from

carrying

away

thesoil.green

foodorganic

foodNo

chemicalsB

epara2.para1.

Present

situation

(However)----(by

contrastpara3.

Introduce

organic

farming----(by

definition)para4.

Other

methods

to

keep

the

soil

fertile.

---(by

giving

examples)The

type

of

the

article

isA narration

（記敘文）xposition（說(shuō)明文）C

argumentation

（議論文）Problems

(？)-----

(byasking/answering)SummaryOrganic

farming

refers

1.

to

cropsgrowingwith

natural

rather

than2.chemical

(chemistry)fertilizers.

When

farmers

use

natural

fertilizers,they

keep

the

air,

soil

and

water

as3.well

asthe

food

supply

free4.

from

chemicals.

Besides,organic

farmers

insist

on

changing

crops

everytwo

or

three

years,5.which

will

put

the

mineralsback

into

the

soil.

Some

organic

farmers

preferplanting

grass

between

crops

to

prevent

wind

orwater

from

6.

carrying

(carry)

away

thesoil.“PLASTIC

OR

CLOTH

BAGS?”how

to

write?Discussion

and

writingPlastic

Or

Cloth

Bags?Para1.

Have

a

brief

illustration

of

the

presentsituation.Para2.

The

problems

caused

by

using

plasticbags.Para3.Introduce

a

new

way--

cloth

bags.Para4.

Conclusion.Problems：cause

white

pollutiondifficult

to

breakdowndo

harm

to

theenvironment and

people's

healthAdvantages：can

bereusedsave

resources3.cheap4.

protect

theenvironmentPlastic

Or

Cloth

Bags?

Plastic

bag

is

very

common

in

our

dailylife.......

however,

...........What

are

the

problem

caused

by

it?firstly/

in

the

first

place,....then,

secondly/next.....in

addition/what

is

more....at

last/finally/last

but

not

the

least.....

Therefore,

we

think

that

cloth

bag

ismorehelpful,..............Why

not

use

cloth

bags

fromnow

on?

We

can

carry

a

cloth

bag

all

the

time,

forexample,

...

such

as,....Plastic

Or

Cloth

Bags?

Plastic

bag

is

very

common

in

our

daily

life，

it

is

easy

forpeople

to

carry

things,however,

too

many

plastic

bags

causelotsofdamage.What

are

the

problem

caused

by

it?Firstly/

in

the

first

place,

most

people

throw

them

away

after

use,

sothey

are

always

here

and

there,

causing

"white

pollution"andmaking

the

ground

dirty.Then,

secondly/next,the

plastic

bag

is

difficult

to

break

down,thechemicals

i