标签：oxygen 相关文章
By the middle of the 1920s the farthest corners of the earth had already been explored: the continents and the oceans had been mapped, the North and South Poles had been reached, and the origins, of the world's major rivers had been discovered. All t
人教全日制普通高中英语（必修）高三(全一册)
[00:00.00] Activity Book Module 1 [00:16.46]Unit 3 Activity 2 [00:30.62]1 Hello [00:33.33]2 Goodbye [00:37.15]3 Hi
新标准小学英语活动用书1册(一年级起点)
[00:00.00] Module 2 [00:11.44]Unit 1 1 [00:29.60]Good moring boyes [00:35.53]Goodbye girls [00:38.11]How are you, Amy? [00:41.67]I'm Lingling.
新标准小学英语活动用书1册(一年级起点)
Module 4 Travel Unit 10 Where are you going on holiday? fantastic 了不起的 get(to) 到达 by 乘坐(...交通工具) Hong Kong 香港 super 超级的;好极了 train 火车 leave for 出发前往;离开去 half 半 past 超过 half past seven 七点
广州小学五年级 (上) 课本(2003)
Item eight. Vocabulary. fossil, molecule, hydrogen, carbon, sulfur. Petroleum has been important since ancient times. In Latin, the name means rock oil. Petroleum is a fossil fuel. The liquid comes from the remains of plants and animals that died mil
step by step 3000 第一册
I love trees because they are an important commodity to the environment. They make life possible on this planet, along with other plants. I also love the trees' glorious display of colors in the fall. I love trees because they have many different sha
听英文对话做选择
Allosaurus was really the first of the truly big meat-eating dinosaurs that was found and was the one from fairly complete remains. 异特龙真的是被发现的第一种大型肉食恐龙而且其骨骼保存相当完整。 It was the Tyrannosaurus
侏罗纪搏击俱乐部
[00:00.00] MODULE EIGHT [00:03.84]Unit two [00:07.92]I think line A is longer than line B. [00:12.20]1.Look,listen and answer the questions. [00:21.76]Is line A a)longer than line B? b)shorter than line B? C)the same as line B? [00:37.80]Can you see
新标准小学英语第五册（三年级起点）
[00:00.00]REVIEW MODULE [00:07.50]Unit 1 [00:10.74]1. Match the questions and answers .then listen and check.
新标准小学英语第五册（三年级起点）
[00:00.00] Review Module [00:08.28]Unit 1 [00:13.56]Exercise 1 [00:19.20]Listen to the questions. [00:23.85]Point to the questions you hear. [00:27.72]Then answer the questions. [00:31.45]What does the cat do? [00:35.00]How many animals will not have
新标准小学英语第七册（三年级起点）
[00:00.00] Review Module [00:08.28]Unit 1 [00:13.56]Exercise 1 [00:19.20]Listen to the questions. [00:23.85]Point to the questions you hear. [00:27.72]Then answer the questions. [00:31.45]What does the cat do? [00:35.00]How many animals will not have
新标准小学英语第七册（三年级起点）
[00:00.00] Module 6 [00:08.91]Unit 1 [00:14.94]Exercise 1 [00:21.00]Listen and repeat. [00:25.16]a paint brush [00:32.21]magic [00:40.25]hungry [00:48.30]a storm [00:56.27]an emperor [01:04.73]an emperorgold [01:12.59]a ship [01:20.35]died
新标准小学英语第七册（三年级起点）
Chapter 17 From Cape Horn to the Amazon 第十七章 从合恩角到亚马逊河 How I got onto the platform I'm unable to say. 我怎样到平台上来，我不能说。 Perhaps the Canadian transferred me there. 或者是加拿大人把我抱上来的
《海底两万里》中英双语有声读物
A couple million years ago, mammoths migrated north from Africa to colonize Eurasia. Sometime around then a massive ice age kicked inand it was stay warm or die. So their tails and heat-shedding ears shrunk, and they grew thick coats of oily fur. But
60秒科学
One main goal in the renewable energy field is to find an efficient, inexpensive way to split water into hydrogen and oxygen. The hydrogen could then be used as a fuel source for vehicles or fuel cells. Typically, an electric current breaks the water
60秒科学
It would have been so cool to have thanked her for being honest and walked out of her office. 如果当时我先对她的坦诚表示感谢，然后大步迈出她的办公室，那肯定很酷。 But alas, I was never cool. I sat there hemming and h
向前一步
Perhaps. Or, proceeding in a more convenient, more economical, and consequently more probable fashion, 或者是这样。或者，他是用更方便，更经济，而且更可能的方法， was he satisfied with merely returning to breathe at the su
《海底两万里》中英双语有声读物
Yael is worried about having enough air to breathe, but Don sets her mind at ease. Y: Oh great! This weekend I have to go to another family reunion, where I'll be sharing a room with my seven-foot-tall body-building cousin Bertha. She's nice enough,
英语时差8，16
台湾籍旅美老师今天交给我们的句子是： Blood is the tissue that not only carries cells that transport oxygen, for example, the red blood cells, or fights infectious diseases, but it also carries messenger molecules, hormone-like facto
留美老师带你每日说英文
Did you ever wonder why sugar dissolves in a cup of coffee? Why not have the sugar just float in the middle of the cup, without dissipating into the coffee? Its because of the way water molecules interact with molecules in other substances. A water m
英语时差8，16