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
阅读下面短文, 根据所读内容, 在文章后小题的空格里填入一个最恰当的单词。注意：每个空格只填一个单词。
No matter young or old all children love to play different interesting games. In a school in Britain at playing time, you will see children playing all kinds of games. And after school if the weather is good and when homework is done, you are sure to find children playing outdoors too.
Everywhere you look in a playground, children are having fun chasing(追) each other! Games of chase are very popular in Britain, just like everywhere else in the world. There are lots of types of chase game, and lots of different names for them depending on which part of the WK you visit. “Tig”. “Tag”, or “Debby” are all names for the same game. In those games, somebody is “it” or “on”. He must chase his friends and try to catch them. If he can slap or tap them on the shoulder, he makes it. When he does, he shouts “Tig! You’re it!”
One of the best things about chase games is you don’t need any extra equipment(设施), like a bat or ball to play. Some games though do need equipment. Ball games are always popular, and wherever you look in the UK you will find children playing football. Often, if there are no goalposts to use, children will use their jumpers or coats as goalposts.
Another popular piece of kit that is found in many playgrounds is a skipping rope. Children take it in turns skipping into the swinging rope and jumping, while a rhyme(短诗) is chanted.
At weekends, when there is lots of time to play, many boys and girls enjoy skating and skateboarding. Most towns have skate parks, which are places where there are ramps(坡道) and rails(扶栏) for doing tricks. It’s fun to ride bikes too. BMX bikes are great for doing tricks and jumps, and some towns have special tracks for people to race or practice tricks at.
Whatever types of game you like to play, there are lots to choose from.
Title: Children’s Games and Sports | |
Children of all 1. enjoy playing different games. If it is fine or when finishing homework, you can 2. see children lain outdoors. | |
What to do | 3. to play |
Chasing games | Children are often seen chase each other 4. in a playground. Different chase games have different names, but “Tig”, “Tag” or “Dobby” stand for the 5. game in the UK. Somebody who is “it” or “on” must chase his friends. He tries to catch his friends by 6. or tapping them on the shoulder and then shouts “Tig! You’re it!” Children can play chase games 7. any extra equipment. |
Ball games | Ball games need equipment. If there are no real goalposts, children sometimes use their jumpers or coats 8.. |
Skipping rope | Children take turns to skip into the swinging rope and jump, chatting a rhyme at the same time. |
Skating and skateboarding | Children can try different 9. along ramps and rails in skate parks. |
10. | Children race or practices tricks along special tracks on bikes. |
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