【每日阅读训练第四期——速度越障25系列】【25-02】科技

Chloe_

好久木有来小分队 对于这个听力不是很明白 是听下来大意么？
Speaker：What start an ice age? Now evidence suggests that a marine algae with shell 700 millions years age, and this algae have adapted the environment that full of low level carbon dioxide. CO2 helps plants to photosynthesis (something like soda?). Temperature falled, causing that C02 became predominant and most plants began to spend life in continents. Now atmosphere reverses because of fossil fuel buring.  Something about human activitivies effect the rate of something? and environmnet no longer needs algae to produce CO2 now.

Time2: 1'42
Peopel once believed that Scottish cows caused illnesses, but now new evidence suggests that humans and importes foods are the main reasons. Also they find that the bacterial strains infecting humans are differ from those found in local cows.
查了一下 To get to the bottom of sth 找出某件事情的真相

Time3: 2'14
The two souces of bacterial infecting are separate. One is from local animals and the other is from other people and imported animals. Reid said that it is hard to determie which one plays a leading role. Because the epidemics are worldwide, other countries should also monitor their food supply.

Time4: 1'21
10% people are left-handed and scientists want to find out the genes of controlling. But the research is not easy. They indicate that different genes of left-hand people are different. Scientists also want to know the relationship among some diseases and handness.

Time5: 1'47  
A gene called PCSK6 has strong tie with the hand preference. Study of mice indicates that Cilia acting like GPS both in animals and in humans. And scientists suggests that there are many other genes that influence handness, waiting to be discovered and they hope researches will help to remove some stigmas of left-handed.

Time6: 1'53
A policy about protecting extinct animals in US. Since the population of grey wolf recovered, grey wolves in these area was 'delisted' of the protection.
But other indicates that by moving the rest of US wolf population, they can concentrate on protecting other wolves (that are subspecies of the grey wolf) out ot these areas.

Obstacles: 8'22 赞一个change君 个人觉得很棒的环境类文章~ 希望更多的人开始注意到这些问题上来!
Legume trees ensure the forest growth and help carbon sink.
These trees contribute to accelerate the rates of taking up carbon faster then non-legume trees.
The rhizobia facilitate the exchange for carbonhydrates and convert nitrogen in the air for plants and neighboring trees.
Tropical trees take up a  huge amount of carbon but adding nitrogen-fixing trees are uncommon in many areas of North America and Europe.Nitrogen fixation is very significant.
The level of biodiversity determines that size of sink. However, the influence of biodiversity can be very different.
Nine legume species they studied did not contribute nitrogen to surrounding trees at the same time.
Some details help scientists to know about future climate change. The computer model show the variation that may differently depending on the abundance and diversity of legumes.
This finding can use the nitrogen fixation into their models and improve predictions about the carbon sink.