题目The atmosphere protects the earth. What is the atmosphere made of? A. Gas and dust B. Water and fire C. Earth and moon D. Stars and gas 相关知识点: 试题来源: 解析 A。本题考查对大气层组成的了解,大气层由气体和尘埃组成。B 选项水和火不对;C 选项地球和月亮不对;D 选项星星和气体...
Earth has an atmosphere. The atmosphere protects us from harmful rays. What is the atmosphere made of? A. Water vapor B. Gases C. Soil D. Rocks 相关知识点: 试题来源: 解析 B。解析:地球有大气层,大气层保护我们免受有害射线的伤害。大气层是由气体组成的。选项 A 水蒸气只是大气层的一部分...
The Earth is surrounded by a layer of gas called the atmosphere. What is one of the important functions of the atmosphere? A. To make the Earth look blue from space. B. To protect the Earth from harmful radiation. C. To make it easier for people to travel by plane. D. To keep ...
This gave the earth its oceans. Water made6.possible for plants to grow. Then the plants createdoxygen in the atmosphere,7.is the gas that humansand animals breathe.Mars is the only planet in the solar system that seems tobe anything like the earth. It is 8.(small)than theearth and ...
What is the role of the atmosphere in protecting the Earth? A. Blocks harmful radiation B. Provides oxygen for breathing C. Regulates temperature D. All of the above 相关知识点: 试题来源: 解析 D。大气层可以阻挡有害辐射、提供呼吸所需的氧气以及调节温度。
This gave the earth its oceans. Watermade it possible for plants to grow. The plants createdoxygen in the atmosphere. Oxygen is the gas that humansand animals breathe.Another planet in the solar system seems to besomething like the earth. That planet is Mars(火星).Mars is smaller than the...
The inner ear is a network of channels containing fluid that moves in response to sound or movement. To perform the function of hearing, the ear converts the energy of pressure waves moving through the air into nerve impulses that the brain perceives as sound. Vibrating objects, such as ...
Astronomers have peeked into the atmosphere of a "super-Earth"for the first time. Their analysis...BotkinKowacki, Eva
What is the main gas in the Earth's atmosphere? A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen 相关知识点: 试题来源: 解析 B。解析:地球大气中的主要气体是氮气。文章中有对大气成分的介绍。选项 A 氧气含量比氮气少。选项 C 二氧化碳是温室气体,但不是主要气体。选项 D 氢气在大气中的含量...
There's the idea of a journey, which is quite poetic, but it's framed in a very scientific context. Here in their laboratory in Marseille, the scientists simulate the formation of a comet and its journey to Earth.有一个关于旅行的很有诗意的想法，但它是在一个非常科学的背景下形成的。在...