Almost all the energy on the earth comes from the sun. Heat from the sun makes the earth warm enough for life. Plants use the sun's energy to live and grow. Plants give off a gas called oxygen. Animals eat plants and breathe oxygen. Animals need plants in order to live, and plants need the sun. You use plants to create heat and energy. You can burn wood from trees. You can burn fossil fuels called coal, gas, and oil. Fossil fuels formed deep underground from plants and animals that died millions of years ago.
The sun's energy can also do harm. Too much sunlight can burn your skin, causing sunburn. Harmful rays from the sun can also cause a disease called skin cancer. Looking right at the sun can harm your eyes. You need to be careful of the sun. The center of the sun is called the core, which is extremely hot. All the energy of the sun comes from the nuclear reactions in its core. It takes a long time for the energy from the core to reach the surface of the earth - about 170,000 years!
11. According to the passage, the sun is vital because ______ .
A. it has its hot core
B. plants live and grow better with the sun's energy
C. plants, animals and people need energy from the sun
D. fossil fuels will be used up and people turn to the sun's energy
12. Fossil fuels formed deep underground from______ .
A. heat from the sun
B. earth and rock
C. oil and gas
D. dead plants and animals
13. The title for this passage could be
A. "Energy from the Sun"
B. "Oxygen and Plants"
C. "Animals and Plants"
D. "The Sun and Fossil Fuels"
14. Harmful rays from the sun may cause ____________ .
A. fever
B. skin cancer
C. pain
D. headache
15. All of the following statements are NOT true EXCEPT
A. the sun's heat does no harm to people
B. looking right at the sun is a way to make your eyes better
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