18 【有课件和完整视频】113部审外研版初中英语八年级下册 Unit1 I hope that you can join us one day PPT课件+优质教学 11:18 【有课件和完整视频】112部审科普版初中英语七年级下册 Unit5 Our School Life,Topic1 How do you usually come 11:18 【有课件和完整视频】111部审科普版初中英语八年级下册...
Before the invention of the wheel in 3500 B.C., humans were severely limited in how much stuff we could transport over land, and how far. The wheel itself wasn't the most difficult part of "inventing the wheel." When it came time to connect a non-moving platform to that rolling cylin...
parasites, and viruses. The system attaches to an existing water supply. It cleans 40 gallons of water in an hour. “We wanted something that could work at a refugee-camp level.
After all, why live in the age of space travel if you don’t own a motorized fork that can twirl your spaghetti at the push of a button? Why struggle to look classy as your heels slowly sink into that soft patch of grass, when someone out there came up with a simple invention that...
NASA came up with at least one solution to that problem. Marc Serota/Getty Images After NASA launches a shuttle into space, a slew of fuel and chemical waste remain on the launching pad and surrounding area. One compound in particular, trichloroethylene, also called "trike," takes a ...
In Jalisco, Mexico, just outside Volcán de Tequila, is this agave field. The Aztecs reportedly used agave as a disinfectant. Matt Mawson / Getty Images The Aztecs, often associated with warfare and elaborate rituals, gave birth to a sophisticated system of government that governed vast territo...
Tom's father is worried about his poor schoolwork. He tries to make him work harder. One day, his father said to him, “My boy, if you get one hundred marks in the exam, I'll buy a new basketball for you.” The boy was very happy to hear that. The next day, Tom came runnin...
put out 5. —Why not go out for dinner? My treat this time. —___. But I'm busy preparing for an interview. A. Not at all B. In your dreams C. Sounds great D. Don't mention it 6. —Mr. Wang is very famous in our school. —That's for sure. He ___ by reporters ...
1. Will computers be used (use) more than books in the future?2. They will be put (put) up on the school website next week.3. Will Tony be chosen (choose) to join the team by the coach nextterm?4. Their new books will be handed (hand) out tomorrow morning.5. Happiness is ...
At the age of 13, I invented something that changed my life. One night, a lion came into my family’s farm and killed one of our cows. I was angry. So I decided to “invent” a solution. The first idea I got was to use fire, because I thought the lion was scared of fire. ...