• Good: They make no fumes.
• Bad: Batteries do not 9. last long / make any fumes.
Detail 2: Hydrogen Cars
• Good: They make no fumes.
• Bad: Hydrogen is 10. expensive / a type of gas.
[11-12] Read and check True or False.
Sounds travel like waves in the air. A sound hits something. It may be a wall or a mountain. Then, the sound bounces back. The bouncing sound is an echo. Imagine you throw a ball against a wall. The ball hits the wall. Then, it bounces back to you. So an echo is like a bouncing ball. It is a sound bouncing back.
11. Sounds can bounce back.
□ True □ False
12. A bouncing wave is called an echo.
□ True □ False
[13-14] Read and check True or False.
Scientists want to study white animals more. But most white animals die when they are young. They stand out because of their color. So their enemies can easily hunt them. But his white penguin is a grown-up. So it is even more special.
13. White animals are easily hunted by other animals.
□ True □ False
14. There is no grown-up white animal.
□ True □ False
[15-17] Read and choose the best answers.
Let's make some compost outside. First, get a compost bin. The bin needs holes for air. Next, put some food scraps into the bin. Dry leaves are also good. Then, stir the pile. This lets air into the pile. Last, wait. It can take two months or more to make compost.
Many tiny animals help. Bacteria and fungi eat the scraps. Snails and earthworms eat them, too. The tiny animals break down the scraps in their bodies. They pass it as waste. This waste is compost!
15. Which is NOT needed to make compost?
□ a. a compost bin
□ b. food scraps
□ c. some water
16. Why does the compost bin need holes?
□ a. to let air into the bin
□ b. to let tiny animals get into it
□ c. to let leaves dry
17. How do the tiny animals make the scraps into compost?
□ a. by eating them
□ b. by touching them
□ c. by piling them
[18-20] Read and choose the best answers.
Helen Keller was born in June 1880 in the United States. Helen became blind and deaf when she was a baby. The world was very dark and quiet for her.
When Helen was seven, she met a teacher, Anne Sullivan. Anne taught Helen how to read. She wrote letters on Helen's palm with her finger. After two years, Helen could read and write very well.
But Helen still could not speak. Helen had to learn it in a special way. She put the fingers on Anne's lips and felt the lips move. This made Helen finally speak.
18. How was the world for Helen until she met Anne?
□ a. dark and quiet
□ b. dark and noisy
□ c. shiny and beautiful
19. When did Helen meet Anne?
□ a. when she was a baby
□ b. when she was seven
□ c. when she was nine
20. What did Helen learn last?
□ a. how to write
□ b. how to read
□ c. how to speak
Answers: 1. needles 2. fungi 3. break 4. palm 5. hope 6. recharge 7. covers 8. hard 9. last long 10. expensive 11. True 12. False 13. True 14. False 15. c 16. a 17. a 18. a 19. b 20. c