Going with the belief that water did not exist on Earth or any other planet at the birth of the solar system, it has been speculated that the water must have flown in from the outer reaches of the solar system, riding on comets,asteroidsor meteoroids. Since they had been at such a gr...
About 70 percent of our planet’s surface is covered with water, and it plays an important role in our daily lives. But how did water get on Earth in the first place?
People did not realize these activities were 6 the Earth. They didn't realize how 7 oil, gas, coal and minerals were being used up. _8 cities grew bigger and spread across the land, plants and animals began to disappear. Their nature homes were destroyed (破坏) as people moved into new...
46. Some desert plants grow d___ into the earth to get water. 47. Humor is a type of language art, which brings a lot of p___ and laughter to our daily life. 48. In Beijing, people’s act of k___ makes me feel warm...
There is___wather on the earth.地球上有很多水How much water is there on earth?地球上有多少水?
listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. 听力原文: ...
A few minutes later I saw Bryce coming down the sidewalk toward his house. I did a double take. All this time I'd thought he was inside the house watching, and he was really outside walking around? I was embarrassed all over again...
And it did not take long for Japanese to do their damage. When the smoke cleared, the Navy counted its losses. Eighteen ships had been sunk o D. ecember 7, 1941 was one of the worst days in American history. Nearly all Americans who are old E. nough to remember that day can still...
drink coffee ... around the year 1000. F: That’s right. I’ve heard that before. M: Yeah, and here’s something else I learned: you need a lot of water to grow coffee plants. F: Yeah, I know. M: Did you know that you need 147 liters of water to get just one cup of ...
They have a kitchen on the spaceship. Its oven(烤箱)can heat food to 170 degrees. The kitchen has water and sets of meals that come on plates. The astronauts choose their menu before they go into space. They take a lot of food with them. How do they keep the kitchen clean? They ...