Do you know why different animals or pests have their special colours? Colours in them seem to be used mainly to protect themselves.
Some birds like eating locusts,but birds cannot easily catch them. Why? It is because locusts change their colours together with the change of the colours of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown colour as crops have. Some other pests with different colours from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.
If you study the animal life, you’ll find the main use of colours is protecting themselves. bears, lions and other animals move quietly through forests. They cannot be seen by hunters. This is because they have the colours much like the tree.
Have you ever noticed an even more strange act? A kind of fish in the sea can send out a kind of very black liquid when it faces danger. While the liquid spread over, the enemies cannot find it. And it immediately swims away. So it has lived up to now though it isn’t strong at all.
1. From the passage we can learn that locusts .
A. are small animals
B. are easily found by birds
C. are dangerous to their enemies
D. change their colours to protect themselves
2.How can pests with different colours from plants keep out of danger?
A. They run away quickly.
B. Their colours are much like their enemies.
C. They hide themselves in the day and appear at night.
D. They have to move quietly.
3.The kind of fish can live up to now because .
A. it is very big and strong
B. the liquid it sends out can help it escape from its enemies
C. the liquid it sends out can kill its enemies
D. it swims faster than any other fish
4.Which is the best title for this passage?
A. The Change of Colours for Animals and Pests
B. Colours of Different Animals and Pests
C. The Main Use of Colours for Animals and Pests
D. Some Animals and Pests
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Some people dislike hiking because they think it is too difficult. However, sometimes it can really be as easy as going out to the park and walking by the river. The places for hiking should be far away from the cars and the noise. Here’s some useful advice for people to go hiking.
First of all, when you choose your first hike, you should be careful. If you choose a too easy one, you’ll still have a nice day outside to enjoy. However, if you choose a too hard one, you may be very tired and can’t have a good time.
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Something about hiking
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9. | When you are in trouble, a mobile phone or a whistle may 10. others to know where you are. A pleasant hike will be good for your studies. |
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A. had a lot of books B. bought candles from others
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A, to grow to love books B. to bring books to people
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C. where Medcalf met Chinese doctors
D. how many village libraries Peru has today
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A. the first church in Peru was set up by John Medcalf
B. car libraries used to be popular in Leonardo's village
C. teachers were interested in bringing books to villagers
D. the barefoot librarians are important to village libraries
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1.Why were fruit flies used for the research?
A.Because they have a similar diet to humans.
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