不知不觉已经快到五月份了，时间是不是过的很快呢，5月份参加考试的考生小编又为大家带来福利啦，2016年5月22日高命中率预测题，大家可要好好把握了，预祝亲爱的考生们能取得好成绩。
阅读文章内容1：
科学家们2000年和2010在两个相隔1500Mile的地方各发现一个物种，这个物种正常情况下是黑色带有少许白色斑点，结果两次发现的是全白色的，这个发现非常神奇。但是科学家们仔细分析了下，说这两个东西不是同一物种，并从三个方面给出了分析。
1. 轻微的颜色差异：第一次非常白，第二次微白;
2. 相隔太远：两次相隔了1500mile，他们在岸边不会走这么远;
3. 年龄估计：第一次估计是20岁，那就意味着第二次得要30岁，科学家表示不太可能。
阅读文章内容2：
生命的形成。
刚开始说地球早起火山喷发使地球山有很多大气，后来就形成了一些简单的植物，后来这些植物吸收了那些甲烷和二氧化碳光合作用产生了氧气和水(后来有个海)，有些简单的生物就在海里形成了。氧气多了之后就形成了一个氧气保护膜，使得地球气温不太高，生物不受SUV伤害(这里有一个对比)太阳系上其他planet因为没有这个氧气保护层所以没法形成生命。然后后面就忘了。
2016年5月22日托福阅读机经参考阅读材料
Life on Earth began more than 3 billion years ago, evolving from the most basic of microbes into a dazzling array of complexity over time. But how did the first organisms on the only known home to life in the universe develop from the primordial soup?
Here are science's theories on the origins of life on Earth.
Electric sparks can generate amino acids and sugars from an atmosphere loaded with water, methane, ammonia and hydrogen, as was shown in the famous Miller-Urey experiment reported in 1953, suggesting that lightning might have helped create the key building blocks of life on Earth in its early days. Over millions of years, larger and more complex molecules could form. Although research since then has revealed the early atmosphere of Earth was actually hydrogen-poor, scientists have suggested that volcanic clouds in the early atmosphere might have held methane, ammonia and hydrogen and been filled with lightning as well.
The first molecules of life might have met on clay, according to an idea elaborated by organic chemist Alexander Graham Cairns-Smith at the University of Glasgow in Scotland. These surfaces might not only have concentrated these organic compounds together, but also helped organize them into patterns much like our genes do now.
The main role of DNA is to store information on how other molecules should be arranged. Genetic sequences in DNA are essentially instructions on how amino acids should be arranged in proteins. Cairns-Smith suggests that mineral crystals in clay could have arranged organic molecules into organized patterns. After a while, organic molecules took over this job and organized themselves.
The deep-sea vent theory suggests that life may have begun at submarine hydrothermal vents, spewing key hydrogen-rich molecules. Their rocky nooks could then have concentrated these molecules together and provided mineral catalysts for critical reactions. Even now, these vents, rich in chemical and thermal energy, sustain vibrant ecosystems.
Ice might have covered the oceans 3 billion years ago, as the sun was about a third less luminous than it is now. This layer of ice, possibly hundreds of feet thick, might have protected fragile organic compounds in the water below from ultraviolet light and destruction from cosmic impacts. The cold might have also helped these molecules to survive longer, allowing key reactions to happen.
Nowadays DNA needs proteins in order to form, and proteins require DNA to form, so how could these have formed without each other? The answer may be RNA, which can store information like DNA, serve as an enzyme like proteins, and help create both DNA and proteins. Later DNA and proteins succeeded this "RNA world," because they are more efficient. RNA still exists and performs several functions in organisms, including acting as an on-off switch for some genes. The question still remains how RNA got here in the first place. And while some scientists think the molecule could have spontaneously arisen on Earth, others say that was very unlikely to have happened.
Other nucleic acids other than RNA have been suggested as well, such as the more esoteric PNA or TNA.
Instead of developing from complex molecules such as RNA, life might have begun with smaller molecules interacting with each other in cycles of reactions. These might have been contained in simple capsules akin to cell membranes, and over time more complex molecules that performed these reactions better than the smaller ones could have evolved, scenarios dubbed "metabolism-first" models, as opposed to the "gene-first" model of the "RNA world" hypothesis.
Perhaps life did not begin on Earth at all, but was brought here from elsewhere in space, a notion known as panspermia. For instance, rocks regularly get blasted off Mars by cosmic impacts, and a number of Martian meteorites have been found on Earth that some researchers have controversially suggested brought microbes over here, potentially making us all Martians originally. Other scientists have even suggested that life might have hitchhiked on comets from other star systems. However, even if this concept were true, the question of how life began on Earth would then only change to how life began elsewhere in space.
以上是小编带来的2016年5月22日托福阅读机经预测，大家可以在最后冲刺阶段多做相关练习。