Sources of Energy
Solar energy is one of the cleanest and most plentiful sources of energy.
Solar power depends on sunlight, so in cloudy weather and at night, no power is generated.
Wind energy is non-polluting, but it’s only useful in places where there is a lot of wind.
Wind turbines (风力涡轮机) convert the kinetic energy (动能) of the wind into mechanical power (机械动力).
Nuclear energy (核能) is efficient and doesn’t produce carbon gases as a waste product.
The dangers of nuclear power include deadly (致命的) radioactive (放射性的；有辐射的) waste products.
A major source of energy comes from the burning of fossil fuels (化石燃料), such as coal and oil.
When we burn fossil fuels, waste gases, such as CO2 are produced.
Fossil fuels remain the largest source of energy for most counties.
Hydropower (水利发电) comes from the kinetic energy of falling water.
Output is reliable and can be regulated to meet the demand, except during periods of drought (干旱).
Exercise:
1.— Which energy source depends on sunlight?
— Solar power depends on sunlight, so in cloudy weather and at night, no power is generated.
2.— What can convert the kinetic energy of the wind into mechanical power?
— Windy turbines convert the kinetic energy of the wind into mechanical power.
3.— Which energy source produces radioactive waste products?
— The dangers of nuclear power include deadly radioactive waste products.
4.— Which energy source comes from the burning of fossil fuels?
— Fossil fuels energy comes from the burning of fossil fuels.
5.— Which source of energy depends on falling water?
— Hydropower comes from the kinetic energy of falling water.
6. Solar power depends on sunlight, so in cloudy weather and at night, no power is generated.
7. Nuclear energy is efficient and doesn’t produce carbon gases as a waste product.
8. A major source of energy comes from the burning of fossil fuels, such as coal and oil.
Repeat & Read Sentences:
1. Fossil fuels remain the largest source of energy for most counties.
2. Hydropower comes from the kinetic energy of falling water.
3. A major source of energy comes from the burning of fossil fuels, such as coal and oil.
4. Nuclear energy is efficient and doesn’t produce carbon gases as a waste product.
Types of Words
Here are some different types of words in English.
Words that are nouns and pronouns are used to represent objects.
A noun or a pronoun can be a person, an animal or a thing, including an idea.
Verbs are used to express actions, such as to sit down or stand up.
We also use verbs to express relationships, such as to love someone or to own something.
We use adjectives to describe objects, such as a tall building.
Adjectives are used with nouns and pronouns, but not with verbs.
We use adverbs to describe actions, such as to run fast or to walk slowly.
Adverbs express the quality of an action, such as how well or poorly something is done.
We use conjunctions to connect things or actions, such as to read and write.
Conjunctions include words such as and, or, because, but and yet.
Exercise:
1. He is tall and thin.
— What type of words are the hightlighted words?
— The hightlighted words are adjectives.
2. I believe in love.
— In this sentence, what type of word is the word "love"?
— The word "love" in this sentence is a noun.
3.— What type of word is used to describe an object?
— We use adjectives to describe objects, such as a tall building.
4.— What type of word is used to represent an object?
— Words that are nouns and pronouns are used to represent objects.
5. We use pronouns to refer to or take place of a noun.
6. We use conjunctions to connect things or actions, such as to read and write.
Repeat & Read Sentences:
1. Words that are nouns and pronouns are used to represent objects.
2. We use adjectives to describe objects, such as a tall building.
3. Verbs are used to express actions, such as to sit down or stand up.
4. We use adverbs to describe actions, such as to run fast or to walk slowly.
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