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(蚱蜢),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(液体) 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.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.

2.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 (逃脱) from its enemies

C. the liquid it sends out can kill its enemies

D. it swims faster than any other fish

3. 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.

A new product – the Apple Watch – into the market. Last year, the watch was firstly introduced by Tim Cook, Apple's CEO. The price of the watch is from $349 to $1,099, depending on its size and whether it is a sports or regular one.

Apple engineers and designers have put in a lot of thought and hard work into creating this "small screen" on your wrist(手腕). The "sensor(传感器)" on the screen not only finds your finger, but also knows the difference between when you are tapping(轻触), and when you are pressing hard er.

The watch also has “haptic feedback(触觉反馈)”. You can s end personal messages to your friend —such as drawing a star or a special sign with your fingers, or tapping the watch, say 3 times, and your friend will receive those taps on their wrist.

Besides telling the time, the watch will use 'Bluetooth' to connect with your iPhone and show calls or text messages that come in.

According to Tim Cook, the watch may open up a whole new area of applications(应用) that we had never thought of. Some car f actories like BMW have developed an app that allows its car owners to open their cars with the watch. A 'Hotels' app may allow you to open the door to your hotel room without worrying about losing the smart-card. And finally, even at the airport—passengers may be able to simply wave their wrist to check into their flight.

The biggest use of the watch, however, is as your personal fitness coach. The watch can show your pulse (heartbeat) using a sensor at the bottom of the watch. It also has the same sensor as your iPhone, so it knows when you are moving, and also how much you are walking or running. It will remind you if you have been sitting for too long without taking exercise.

1.We can learn from the passage that the Apple Watch .

A. is designed by Tim Cook

B. was brought into the market last week

C. sells at different prices for different colors

D. can show your pulse and knows when you are moving.

2.With apple watch, you can .

A. develop your own personal app

B. connect your iPhone with your iPad

C. receive personal messages from your friends’ iPhone

D. send personal messages to your friends’ apple watches

3.Many businesses help push for the uses of apple watch EXCEPT .

A. hospitals B. hotels C. airlines D. car factories

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