网上科普有关“第十一届上海市中学生中科普英语竞赛的参考资料《中学生科普英语趣味阅读》有没有听力材料呢？”话题很是火热，小编也是针对第十一届上海市中学生中科普英语竞赛的参考资料《中学生科普英语趣味阅读》有没有听力材料呢？寻找了一些与之相关的一些信息进行分析，如果能碰巧解决你现在面临的问题，希望能够帮助到您。
．The World Population
世界人口
2．Bees and Colour
蜜蜂和颜色
3．Fires Long AgO
很久以前的火
4．Flying
飞行
5．Solids，Liquids and Gases
固体、液体和气体
6．RocketS in the Sky
空中火箭
7．Deean Living
海洋生活
8．We Pollute the Air
我们污染了空气
9．Beautiful，but Dangerous
美丽，但危险
10．Overcoming the Problem of Waste
解决废物问题
11．The Sun
太阳
12．Tea
茶
13．Are SOunds Useful or Harmful？
声音有益还是有害？
14．Animal Mimics
动物的保护色
15．Oil in the Earth
地下石油
16．Robot
机器人
17．Atoms，Plants and the Sea
原子、植物和海洋
18．Quakes to Come
即将到来的地震
19．Electric Wire
电线
20． Lignt
光
21．Gravitation
引力
22． The Soil
土壤
23． Irrigstion
灌溉
24．Pendulums
摆
25．Journey to the Moon
月球旅行
26． Electricity
电
27．Cells
细胞
28．The Purifichtion of Water
水的净化
29．Photosynthesis
光合作用
30．Expansion and Contraction
膨胀和收缩
31．Something about Atoms
谈谈原子
32． Inertia
惯性
33．Life in the Universe
宇宙中的生命
34． The First Men to Fly
第一批飞行者
35． Moonlight
月光
36．The DeVelopment of Rubber
橡胶的发展
37． Electric Trains
电气火车
38． The Spe of Sound
音速
39． Discovery by“Accident”
偶然的发现
40．The Beginning of the Air Mail
空邮的开端
41．Color
颜色
42．The Sun’s Family
太阳系
43．The Story of Salt
盐的故事
44．Behind the Looking Glass
镜子背后的故事
45．Floating Bodies
浮体
46．Using Weather Information
利用天气信息
47．Seeing Things
看见物体
48．Stars
星星
49．Bath and Bathing
洗澡和沐浴
50．Cosmetics
化妆品
51．Dislexia
读写困难症
52． What is Heat？
什么是热？
53．Heat Conduction
热传导
54． Colour Television
彩色电视
55． Sources of Energy
能源
56．HOW Nature Breaks Rocks？
大自然是怎样破坏岩石的？
57．Expansion of Liquids and Gases
液体和气体的膨胀
58． What is Chemistry？
什么是化学？
59．The Migution of Birds
候鸟的迁移
60．The Pole Star
北极星
61．Sir Isaac Newton
艾萨克·牛顿爵士
62． Volcanoes
火山
63．Earthquake Control
控制地震
64． Water
水
65．Dust
灰尘
66．How old is the Earth？
地球有多大年龄？
67．The Discoverer of X-rays
X射线的发现者
68． The Desert
沙漠
69．Cotton
棉花
70． What People don’t Know about Air
空气趣闻
71．The Camel
骆驼
72． Exploring the Planets
探索行星
73．Halley’s COmet
哈雷彗星
74． MysteFy of Time
时间之谜
75．Natural Medicines
天然药物
76．Pain
疼痛
77．Today'S RobotS
今天的机器人
78． Trees
树
79． Vitamins
维生素
80．Functinns of Roots and Leaves
根和叶的功用
81．Electricity：the FOrce that Transformed the World
电：改造世界之动力
82．Mystenes of the Sea
暗银河系的发现及其科学意义
In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers. Possibly as numerous as conventional galaxies, these galaxies have the same general shape and even the same approximate number of stars as a common type of conventional galaxy, the spiral, but tend to be much larger. Because these galaxies ’mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies. Apparently these low-surface-brightness galaxies, as they are called, take much longer than conventional galaxies to condense their primordial gas and convert it to stars—that is, they evolve much more slowly.
These galaxies may constitute an answer to the long-standing puzzle of the missing
baryonic mass in the universe. Baryons—subatomic particles亚原子粒子 that are generally protons or neutrons—are the source of stellar, and therefore galactic, luminosity, and so their numbers can be estimated based on how luminous galaxies are. However, the amount of helium in the universe, as measured by spectroscopy光谱学, suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate. Astronomers have long speculated that the missing baryonic mass might eventually
be discovered in intergalactic space星系际的空间 or as some large population of galaxies that are difficult to detect.
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另类海豹哺乳方式与众不同
Until recently, zoologists believed that all species of phocids (true seals), a pinnipped family, use a different maternal strategy than do otariids (fur seals and
sea lions), another pinniped family. Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after birth. Throughout the rest of the lactation (milk production) period, which lasts from 4 months to 3 years depending on the species, mother otariids alternately forage at sea, where they replenish their fat stores, and nurse their young at breeding sites. Zoologists had assumed that females of all phocids species, by contrast,
use a fasting strategy in which mother phocids, having accumulated large energy
stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species. However, recent studies on
harbor seals, a phocids species, found that lactating females commenced foraging
approximately 6 days after giving birth and on average made 7 foraging trips during the remainder of their 24-day lactation period.
The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation. Harbor seals are small compared with other phocids species such as grey seals, all of which are known to fast for the entire lactation period. Studies show that mother seals of these species use respectively 84 percent, 58 percent, and 33 percent of their fat stores during lactation. By comparison, harbor seals use 80 percent of their fat stores in just the first 19 days of lactation, even though they occasionally feed during this period. Since such a large proportion of their fat stores is exhausted despite feeding, mother harbor seals clearly cannot support all of lactation using only energy stored before giving birth. Though smaller
than many other phocids, harbor seals are similar in size to most otariids. In addition,
there is already some evidence suggesting that the ringed seal, a phocids species that
is similar in size to the harbor seal, may also use a maternal foraging strategy.
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pheromones是什么东东，是不是该划为odorant
There is no consensus among researchers regarding what qualifies a substance as a pheromone. While most agree on a basic definition of pheromones as chemicals released by one individual of a species which, when detected by another individual of the same species, elicit a specific behavioral or physiological response, some researchers also specify that the response to pheromones must be unconscious. In addition, the distinction
between pheromones and odorants—chemicals that are consciously detected as odors---can be blurry, and some researchers classify pheromones as atype of odorant. Evidence that pheromone responses may not involve conscious odor perception comes from the finding that in many species, pheromones are processed by the vomeronasal (or accessory olfactory) system, which uses a special structure in the nose, the vomeronasal organ (VNO),to receive chemical signals. The neural connections between the VNO and the brain are separate from those of the main olfactory system, whose processing of
odorants triggers sensations of smell. But while the VNO does process many animal
pheromone signals, not all animal pheromones work through the VNO. Conversely,
not all chemical signals transmitted via the VNO quality as pheromones. For example,
garter snakes detect a chemical signal from earthworms—one of their favorite foods—via
the VNO, and they use this signal to track their prey.
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