时间:2019-01-09 作者:英语课 分类:河北加拿大版初中英语


英语课

UNIT 4

[00:03.08]Lessons 25~32

[00:08.05]Look into Science!

[00:11.89]Lesson 25:

[00:16.64]Keep the Candle Burning!Science is so interesting!

[00:23.72]I'm sure you'll like this experiment!

[00:28.68]When you do this experiment,you will learn something about air!

[00:34.64]What do you need?

[00:37.80]a candle

[00:40.67]a candleholder

[00:44.02]a big glass jar

[00:48.14]a shallow 2 dish with water

[00:52.58]matches

[00:55.43]To make a candle burn,you "light" it. What do you use?

[01:02.56]A match.What do you do?

[01:07.89]1.Put the candle in the candleholder.

[01:14.14]2.Put the candle- holder 1 in the dish

[01:20.38]3.Fill the dish half full of water.

[01:26.86]4.Light the candle.

[01:31.61]5.Let the candle burn for two or three minutes.

[01:39.47]6.Carefully put the jar over the candle.

[01:46.74]7.Look at the water in the jar.What observation 3 can you make?

[01:56.72]What is happening?

[02:00.06]As the candle burns,it uses up oxygen in the air.

[02:06.90]When the candle stops burning it has used up all the oxygen in the air.

[02:16.05]The water inside the jar then rises.

[02:22.11]How far did the water rise?Air is about one- fifth oxygen,

[02:30.36]so the water rises and fills about one- fifth of the jar.

 



n.持有者,占有者;(台,架等)支持物
  • The holder of the office of chairman is reponsible for arranging meetings.担任主席职位的人负责安排会议。
  • That runner is the holder of the world record for the hundred-yard dash.那位运动员是一百码赛跑世界纪录的保持者。
adj.浅的,肤浅的,浅显易懂的;n.(pl.)浅滩,浅处;v.变浅
  • The dish is too shallow to serve soup in.盘子太浅,盛不了汤。
  • His analysis was always shallow.他的分析总是很肤浅的。
n.观察, 观测, 观察资料(或报告)
  • The new breed is under observation.新品种正在观察中。
  • Did you keep him under observation?你对他进行监视了吗?
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学英语单词
acumycin
adderall
adjusted uranium
analia
antialcoholism
bois de Belleau
box silk coloured brocade
budgetary estimates
calvish
celluar container vessel
Chainia
change agent
chilometre
coach board
commercial package
compound average
convex papilate
Couton's disease
Cyclobalanopsis gilva
D-T reactor deuterium-tritium reactor
design master
detritus tank
deuterostoma
double shaft drive
endorsement commission
epilation dose
examplary damages
expected frequency
expiratory pressure
extended display identification data
flashlight source measurement
flexuosus
forced-entry
foreign exchange sold
freelances
fully-articulated crash test dummy
Gaskell, Mrs. (Elizabeth Cleghorn Stevenson Gaskell)
general rate of profit
genus Alliaria
geronas
Hamburg, Land
hang scoop scale
head the bill
hemolysinogen
HERALD equipment
in the employ of sb
intervanient party
intestinal hormone
key terrain
knuckle pin
Kundia
Liparis
Lowenberg-Abel bacillus
map-based
mathematical sedimentology
minimal audible intensity
montages
mosaicproteins
Nangarhār, Velāyat-e
national pension
natural focal infection
nonstereoselective
object-oriented design methodology
oil disc for air cleaner
optical viewfinder
overlegislates
patino
practiced
raw sheep skin
Rhizoma Corydalis Decumbentis
Salammonice
SAM Site
sana
sappodilla
sclerid
servias
shafting centre line
shelfmark
shovable
silver tartrate
silvermine mts.
simultaneities
soap making machine
sprag type one way clutch
st.james
statebased
Sunnitic
Tarns-A
tincal(tinkal)
tinlined case
tonsorial
toxic scarlet fever
traditional export commodity
uncomplimentaries
unloaded radial wheel run-out
uranium 238
volume of exports
warehouse automation
warm water species
Web box
zerde