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
-nerved
22-hydroxyacuminatine
Abenab
acarinium
air hostesses
alitexes
amicrobic
anonymous classes
appetitive phase
asphodels
Aylmer
bandala
barge stone
be shitting bricks
Bellotto, Bernardo
big enchilada
bilinear
Black Combe
calendrical
casstanopsis chingii a.camus
checks me out
continuous data protection
Continuously variable.
decimal literal
defaite
defective
degenerate specimen
descesional ventilation
desecularized
diametral voltage of a polyphase system
Dig way down deep
direct running torque converter
Dolomiaea souliei
empirically testable proposition
enercology
examination table
exponential probability density function
fish carver
front-drive rake
go behind
gourmet
growth production
grued
high-voltage tube
Hill's katathermometer
inorganic reaction chemistry
ketogluterate
Krause's glands
kreshka
land waiter
lassu
legges
lithophaga canalifera
loan officer
log standard
lytic virus
mesostigmal plate
moydite-(Y)
muscle accentuated
Musculus obliquus auricularis
oromandibular arch
oropendolas
outdoor meter
oxotestosterone
parietal bones
perspective mapping
phosphosilicate
plant tax
plus-petere
post-constitutional
reducing station
reservoir production performance
reverse stock split
rhizoma curcumae longae
sabine pine
saturated steam (vapor)
second auction
seismocardiographic
serial arrangement
shaft section
Shebalino
snow plough
specified cost
spouse-breach
spring pivot eat
stellar map watching
Streptomyces josamycetinus
tarwhines
tenantcy
tender report
thermal weldability
thin film optical components
Thiosporin
Tom Tom
torsion joint system
Tulbagh
unitingly
User Network
valorize
ventriculosubarachnoid
wind speeds
window-washer