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
As you sit in silence
Wondering why
I’ll be your shoulder to cry on
Until your tears run dry
When you’ve been hurt
And can’t believe what they’ve done
If you need someone to talk to
I’ll be the one
And you don’t understand
Remember I’m here
I’ll lend a helping ___________
Burdens are lighter
When shared by two
And I just want you to know
I’m here for you
1.The underlined part in the line “I’ll be the one” refers to _________.
A.a listener B.a helper C.a cleaner D.a finder
2.The best word to fill in the blank of the poem is _________.
A.care B.hand C.mind D.engineer
3.From the poem, we know that “I” will _________.
A.find a shoulder for you B.share all your burdens
C.understand your close friends D.help you believe your friends
Lots of people love to keep pets, but they don’t know how to communicate(交流) with their pets. Are you one of the _______? If your answer is “yes”, here are some _______ for you.
Chat with your pet. Your pet may not _______ understand our words, but he can at least pick up on the tone of your words and your body language when you _______ him. For example, if you speak with him in a _______ and hard voice, he might pick up on the fact that you are unhappy with his behavior(行为).
Use non-verbal communication. Your non-verbal communication is just as _______ as verbal communication.
Non-verbal communication is often used in _______ your pet to do a certain activity. _______, if you are sitting on your horse, you would use your legs and hands to tell your horse to turn on the forehead. When you teach your dog to sit, you would actually use both verbal and non-verbal communication(hand signals) to give him the “sit” order.
Don’t punish(惩罚) your pet. Punishing your pet is never a good idea. Punishment can make your pet afraid of you and you will possibly _______ the trust and respect that he has for you. __________ some pets, like cats, do not necessarily make the connection between your punishment and the behavior you are punishing them for. They don’t understand why you do that at all.
1.A.keepers B.teachers C.doctors D.pets
2.A.reasons B.topics C.tips D.results
3.A.nearly B.exactly C.mainly D.certainly
4.A.lead to B.come to C.add to D.talk to
5.A.sweet B.smiling C.cold D.strange
6.A.important B.slight C.possible D.correct
7.A.making B.teaching C.inviting D.advising
8.A.For example B.At first C.As a result D.Instead of
9.A.accept B.win C.lose D.miss
10.A.Suddenly B.However C.Otherwise D.Moreover
— I am going to the Purple Mountain myself to take photos of fireflies(萤火虫).
— __________. You are too young to go there alone. Moreover, you can hardly find them in winter.
A.Good idea B.I think so C.No problem D.You’d better not
The suffix in the word healthy means “__________________”.
A.not B.full of C.without D.having the quality of
Which sentence has the same structure as “I saw some kids kicking the ball in the park”?
A.I always find English easy and useful. B.I am feeling much better than yesterday.
C.I bought my father a scarf for his birthday. D.I saw a lot of foreigners the day before yesterday.
