时间:2019-02-21 作者:英语课 分类:托福英语


英语课

 考生要熟知托福文章的宏观框架,从整体上hold住任何一篇考试文章。托福文章结构分为两类,一类是学术论文,以“立论、证据证明、驳论(再立论)”的循环方式打开;另一类是学术说明文,讲授某个科学知识,并不需要驳论,通常以“分类叙述加生动形象的例子展示”,或以“时间轴讲述加生动例子”的方式打开。今天的第一篇和第三篇文章就属于第一类,第二篇文章属于第二类。


  第一篇Day Length and Flowering Plants(白昼长度和开花植物),首段引出话题,描写植物能够感受季节变化,如秋季落叶。第二段开始立论,认为植物感知季节变化也许依靠气温和降雨,但是气温和降雨变化无常(capricious),并不是稳定信号(not reliable signals)(驳论)。而在任何纬度任何一天中恒定规律变化的是光照量,所以推测植物可能依靠光照量的变化来感知季节变化,这被称为植物的光周期现象(photoperiodism)(再立论)但最近研究发现,植物感知的并不是光照时间,而是连续黑暗的时间(驳论再立论)。更深入的研究发现,导致植物感受黑暗的是自身光敏色素(phytochrome)的存在。光敏色素分为两种形式:压制开花状态和促进开花状态。而连续黑暗时间的变化会诱导这两种形式的互相转化。(由表入里,挖掘根本原因)。

标签: 托福阅读
学英语单词
a slut
Alliance for Progress
artificial duct
asymptotic slope
beldame
bid-price
bierstekers
blank map
Briss
catheretic
cathodic protection automatically controlled
causeymakers
cet. par.
chilauni
Coffeen Lake
compost grinder
Conia.
cooled-air circulation refrigeration machine
crystal sender
denalis
dibenzyltin dibromide
earth filtering
epoxy-amine resin
financial services sector
Fluvoxaminum
FSBO
fuel-savings
gadolinites
gosther
hard to get
hide your light under a bushel
high-centre
hokiangas
hopper freight car
Humbauville
if push comes to shove
integral ring
isdn digital subscriber line
Kichma
larval molting
lime arsenate
lineshaft
loovesum
m mode ultrasonic scanning
mass extinction coefficient
Mead, Margaret
medullary plate (or neural plate)
metal halide
metauranopilite
microsporosis capitis
My Quang
nonelement
oceanic bonitoes
office of prime minister and cabinet
Olintepeque
outline bar
palaeocon
phellodendron amurenses
piezoelectric driver
pillar crane
plasterable
political agenda
polyp of rectum
polyphenylene sulfide composite
priscillians
pullig
quadrumana
records service firing
rocker keel
roof structure to falls
rotating coupler
Rotava
salsaed
sindony
sisso
sodium metazirconate
speedometer main shaft
squeakless
stereocamera
stiklestad
studio floor
subgalea
subsurface trickle irrigation
superparts
supervacaneousness
television tape
text library
the fine print
the presence or absence of anthocyanin pigments
the sweets and bitters of life
thrust lift nozzle
time trial
unilateral hermaph-roditism
uniprocessor system
unrestless
value number
vertical phasing
vibration regulation law
wastoid
water bone infection
xestia csoevarii
yolk sphere