时间:2019-01-22 作者:英语课 分类:英语时差8,16


英语课

Evolution In Action Although rainforests cover less than two percent of Earth’s surface, they are home to more than half of all plant and animal species. How did rainforestsevolve so much more diversity than other parts of the globe? For starters, tropical species have had longer to evolve without extreme challenge from things like glaciers 1. Instead of destroying rainforests, climate changes like the ice ages usually just cause them to shrink. As a matter of fact, this periodic shrinkage might actually help generate more new species than it kills off.This is how it happens. When a rainforest shrinks, it sometimes fragments into isolated 2 rainforest pockets. These pockets can stay separated long enough for the isolated plants and animals to begin developing into different species from their cousins next door. When the pockets grow back to form a single forest again, the forest can have twice the number of species that it started with. Scientists working in the Daintree and Atherton Tableland rainforests of Australia have uncovered strong evidence for this. These rainforests are connected now, but during ice ages they were separated by a dry area. The scientists studied the genes 3 of birds and lizards 5 living on opposite sides of this area. Almost all the bird species showed a significant amount of genetic 6 difference. What’s more, scientists found that the genes of one lizard 4 species–the prickly skink–were so different that these skink are well on their way to becoming two separate species. We usually think of climate disasters like ice ages as bad news for life everywhere. In rainforests however, they can be an engine which, over time, enriches the web of life on Earth.



冰河,冰川( glacier的名词复数 )
  • Glaciers gouged out valleys from the hills. 冰川把丘陵地带冲出一条条山谷。
  • It has ice and snow glaciers, rainforests and beautiful mountains. 既有冰川,又有雨林和秀丽的山峰。 来自英语晨读30分(高一)
adj.与世隔绝的
  • His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
  • Patients with the disease should be isolated. 这种病的患者应予以隔离。
n.基因( gene的名词复数 )
  • You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因,所以能够活得很长。 来自《简明英汉词典》
  • Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
n.蜥蜴,壁虎
  • A chameleon is a kind of lizard.变色龙是一种蜥蜴。
  • The lizard darted out its tongue at the insect.蜥蜴伸出舌头去吃小昆虫。
n.蜥蜴( lizard的名词复数 )
  • Nothing lives in Pompeii except crickets and beetles and lizards. 在庞培城里除了蟋蟀、甲壳虫和蜥蜴外,没有别的生物。 来自辞典例句
  • Can lizards reproduce their tails? 蜥蜴的尾巴断了以后能再生吗? 来自辞典例句
adj.遗传的,遗传学的
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
学英语单词
7-methoxyindole
acephalhemia
alcoholic neuritis
almain
american persimmons
apoquinine
araneous
atelorachidia
atras
be all over
bench floor
binomial probability
blink
broadcasting power
C. S. F.
calm sb down
Charites
chicot
cidap
Coelogyne stricta
commercial rules for import and export trade
congeable
cosshe
deliver to
derivative trader
devalorizes
dictionary-monger
diesel fuel improver
disvulnerability
double-sideband transmission system
dovetail anchor
eclosion hormone
electric regenerative braking
emophytic
energy flow chart
epiphenomenalizes
epsdt
evacuchairs
expectation driven reasoning
Fabry lens
Fed Model
film (-wise) condensation
fluidic wind sensor
foul manuscript
foveolate
fractional step method
Guardianistas
gunstock
Gvim
hand gauge
have a sneaking suspicion
heliotropium peruvianum l.
hour wheel
Impatiens distracta
interior beam
Kleinniedesheim
lateral collateral sesamoidean ligaments
leg extensions
lever hook
linesmen
live like pigs in clover
lung books
multibatches
nonharmonic component
normality
operating policy
orange squash
Ostrovnaya
outside operation form
p105
pankey
pie-in-the-skyer
plow press drill
power house at damtoe
pownce
pretentiously
propylene glycol monostearate
radiative excitation
Repeat loop
resonance type voltage regulator
rheological coefficient
Roches-Bettaincourt
screw diameter
Shāh Kūh Bālā
spiculella
straight-billed
stretch marks
substantial labour surplus market
sun-fri
superconducting memory array
Sycamine tree
SysV
Ten Boer
theatricalness
transfer on less than zero
trapholes
triple-phase region
Tsmed (Ath Thamad)
universal coordinator routine
without fraudulent intent
writerships
zungenbecken