解析 B 题目询问北极熊的体重变化,属于细节理解题。根据第四段的明确信息“As a result, bears today are 60 pounds lighter than what they were.”可知,当前北极熊的体重比过去减少了60磅。B选项“现在北极熊的体重比原来少了60磅”直接对应原文内容,因此正确。其他选项未在文中提及或与原文矛盾,故排除。
Learn about the definition of air pollution, and see air quality categories. Discover the list of air pollutants and their sources, and know types of air pollution. Related to this QuestionWhat are the gases that constitute...
Irritant GasesThese are gases which also accumulate at the bottom of enclosed spaces due to being heavier than air – they include Phosgene, Chlorine or Ammonia. Exposure to these causes predominantly respiratory issues such as bronchitis or bronchiolitis as they cause an inflammatory response when th...
Learn about Earth's atmosphere and the characteristics of the five layers of the atmosphere. Understand what the atmosphere is made of and the composition of air. Related to this Question What gases are found in the mesosphere? What gases are found in the stratosphere?
I expect that you would answer, Blue. I am afraid that you would be wrong. The sky has no color. When we see blue, we are looking at blue sunlight. The sunlight is shining on little bits of dust in the air. We know that there is air all around the world. We could not breathe...
Warming-up What Are Substances Composed of? The theory of four elements As recently as a few thousand years ago,western scientists considered the whole earth to be made of 4 elements:Earth,Air,Fire,and Water.Air was the underlined element:this single substance made up everything in the world...
The sun contains several gases and other elements that give off electromagnetic radiation, allowing scientists to study the sun despite not being able to access physical samples. TL;DR (Too Long; Didn't Read) The most common gases in the sun, by mass, are: hydrogen (about 70 percent, heli...
Helium, being lighter than air and non-flammable, is safe and causes balloons to float. 9 Can Inert Gases be found outside of Group 18? Yes, while all Noble Gases are Inert Gases, some Inert Gases, like nitrogen, are not in Group 18. 7 Is it correct to say nitrogen is a Noble Ga...
” However, we can get there eventually, he adds: “Lithium-air batteries[lighter than current lithium-ion batteries, though with inherent engineering challenges that have yet to be solved] have specific energy that’s comparable to jet fuel. But it’ll be a long way to get them – almost...
题目 2. The mass of a honeydew is 1 850 g. It is 680 g lighter than a durian.a) What is the mass of the durian?)What is the total mass of the two fruits?(Give all your answers in kg andg.)2kg Ans: a) __b) 530g 相关知识点: 试题来源: 解析 2kg530g 反馈 收藏 ...