Humans need special glasses or at least flashlights to see in the dark. 【小题1】 Many animals have developed amazing abilities that allow them to live in the dark. 【小题2】 For example, bats (蝙蝠) use sounds to sense enemies in the dark. This ability is called echolocation (回声定位能力). It makes bats live safely. Other animals, such as mole rats (鼹鼠), are almost blind but they use their strong sense of smell to decide enemies in the dark. And another kind of the lovely animal — dolphins also depend on this ability to find food and communicate with their friends.

【小题3】 This is called bioluminescence (生物性发光). Fireflies use this ability to communicate. A kind of firefly in South America has two “lights” on its body. 【小题4】 The long red light on the head lights up when the environment around is peaceful. The long green light on the tail can warn the partners that there is an enemy or other danger.

Bioluminescence is also useful for fish that live deep in the ocean where light from the surface does not reach. They require this ability to get energy for their living. 【小题5】 From bats to fireflies and fish, nature has created many wonderful ways for animals to live freely in the dark.

We know the mosquitoes(蚊子) very well because they fly everywhere. They can be found almost all over the world, and there are more than 2,500 kinds of them.

No one likes the mosquito. But the mosquito may decide that she loves you. She? Yes, she. It’s true that male(雄性) mosquito doesn’t bite and only the female(雌性) mosquito bites(咬) because she needs blood to lay(孵) eggs. She is always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn’t like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just remember you are chosen. You’re different from the others! If the mosquito likes you, she lands on your body without letting you know. She bites you so quickly and quietly that you may not feel anything different. After she bites, you will have an itch(痒) on your body because she puts something from her mouth together with your blood. By the time the itching begins, she has flown away.

And then what happens? Well, after her delicious dinner, the mosquito feels tired. She just wants to find a place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs.

Most people like tomatoes. And they think tomatoes is a vegetable, because they are not sweet and are used to add flavor(口味) to food. 【小题1】.

Tomatoes are from Mexico(墨西哥). Spanish explorers(探险家) went to South America about 500 years ago, and then they brought back the tomatoes to Europe. Because the tomatoes look like apples, the French called them Love Apples, the British called them apples of gold. 【小题2】

【小题3】As far back as 500 years ago, the joys of eating fried tomato with salt and pepper, was known to the Italians.

In some countries like England and Mexico, tomatoes were thought to have poison(毒) in them. 【小题4】 The belladonna is regarded as a plant with poison. But people grew them in their gardens because of their beautiful color and look. They even thought that tomatoes caused diseases. 【小题5】 They began to eat them.

It is believed that the British brought the tomato to India. This was about 300 years ago. Gradually, the people in India started discovering that the tomato tasted good. Today, the whole world is crazy about tomatoes.