题目内容
As a child - and as an adult as well - Bill Gates was untidy. His mother made weekly clothing plans to help him. On Monday he might go to school in blue, on Tuesday in green, on W1. in brown, on Thursday in black, and so on. Bill Gates hated wasting time, both at work and during his spare time. Every year, he and his friends would go to summer camp. Bill liked soccer and other sports. One of his friends at summer camp said, "We all know that Bill is c2. than us. Even when he was nine or ten years old, he talked like an adult and could express himself in ways that none of us understood."
Bill Gates did also better in math and science. His parents sent him to an all-boys' school for top students. In 1968, he started to have computer lessons at school. Bill and his best friends, Kent Evans and Paul Allen, got interested in it i3.. Whenever they had free time, they would run over to the computer room to use the computers.
At the age of 14, Bill Gates started to write short programs for the computer. Why was Bill so good a4. programming? One of the reasons is because it was about math. What's more, Bill and Paul enjoyed reading m5. like 'Popular Electronics', and Bill also read business newspapers. At last, the two men made up their mind to set themselves up as a company.
阳光课堂课时作业系列答案We can use milk to make all kinds of things. Here’s how to make plastic:
You will need | Teaspoon Vinegar（醋） Measuring cup Whole vitamin D milk (nonfat or low-fat) Sauce pan Adult helper Stove |
Do this | 1. Pour 2 cups (500 ml) of milk into the sauce pan. 2. Ask the adult to heat the pan slowly on the stove. 3. Just before the milk boils, bubbles will start to appear on its surface. 4. When that happens, slowly put in two teaspoons of vinegar. 5. Keep stirring(搅拌) until the milk becomes rubbery(橡胶状) and hard to move. 6. Remove the pan from the heat and let it cool. 7. When the milk is completely cool, remove the solid from the pan, squeeze it into a ball and wash it under cool running water. |
What happened? | A chemical reaction takes place between a chemical(化学物质) in the warm milk and acid(酸) in the vinegar, and the result is a rubbery solid that does not dissolve in water. The milk has to be heated for this experiment to work. The white glue that comes in a squeeze bottle is one of the many useful things. That can be made from the chemicals in milk. |
1.What do we need to make plastic?
A.Two cups of low-fat milk. B.An adult helper.
C.Vinegar, sugar and acid. D.The white glue.
2.Which of the following is true about the experiment?
A.The milk should be cool for doing the experiment.
B.Keep stirring the mixture of milk and water until it is cool.
C.Bubble will start to appear when the milk becomes rubbery.
D.A chemical reaction takes between the warm and the vinegar.
3.Which of the following is the best title for the passage?
A.Different Uses of Milk B.Glue Made from Milk
C.Different Uses of Plastic D.Plastic Made from Milk