精诚凝聚_成就梦想
学习目标1学习新单词和掌握文章的主旨大意2提高学生的阅读能力
学习重点学习了解这两个科学实验学习难点数字，分数表达法
预习案
使用说明学法指导：1预习时，把课文读两遍，第一遍通读教材，完成表层理解，第二遍勾画出文中的疑难点。2完成时间30分钟。一I
troductio

1Wordsaboutge
eralscie
ceTra
slatethefollowi
g
1大众科学
2固体
4气体
5存在
7膨胀
8收缩
10钢
11铁
13物质
14氧气
16自然的天然的
17人造的
3液体6加热9金属12混合物15表面
2DoEx123P41二、Vocabulary11十二（一打）
4千
2二十5百万
3百6十亿
7doze
sof
8scoresof
9hu
dredsof
10thousa
dsof2分数表达：
11millio
sof
口诀：“分子基数词，分母序数词。分子大于1，分母加s”
13
45
aquarter
34
三、Readi
ga
dVocabulary
Readi
gcomprehe
sio

ⅠListe
topassageAa
dfilli
thebla
ks
Itishardto
aworldwithoutmetalsDiffere
tmetalshavediffere
t
uses
steelisusedi
carsa
diro

electrical
equipme
tWhe
weusemetalsitisimporta
ttok
owhowthey
withdiffere
t

forexamplewatera
doxyge
The
ofmetalsca
be
Hereis
atablewithmetalsthatreactmost
a
dthemetalsthatreact
least

IIStructureReadpassageBa
dfilli
thebla
ks
Pleasefilli
eachbla
kwithi
threewordsafterreadi
gthetexto
Page45
___1___
Tofi
doutifiro
rustsi
dryairairfreewatera
dordi
arywater
Apparatus
3clea
iro
ailstesttubes___2_cotto
wooloilBu
se
bur
er
■点亮心灯v照亮人生■
f精诚凝聚_成就梦想
Situatio

__3__
___4____
Co
clusio

Iro
i
dryair
Putsomeiro
ails__5__ofThe
ailshaveIro
does
otrusti

atesttube

otrusted
dryair
Pushsome_6___dow
the
tube
Leavethetubeforo
eweek
Iro
i
airfreewaterHalffillatesttubewith
The
ailsdo
otIro
does
otrusti

water
rust
airfreewater
Boilthewaterforthree
mi
utesto___7___thereis

oairi
thewater
Put_8__clea
ailsi
the
water
Add_9__tothewaterto
keepairoutofthewater
Leavethetubeforo
e
week
Iro
i
ordi
arywaterHalffillatesttubewith
The
ailsrustIro
rustsi
ordi
ary
watera
daddtwoorthree
water
_10____
Leavethetubeforo
eweek
探究案
IReadthepassageABcarefullya
da
swerthefollowi
gquestio

1WhichisthebesttitleforthepassageA
ATheDiffere
tusesofMetals
BTheReactio
ofMetals
CTheReactio
ofMetalswithWater
DTheReactr