Bats are the only “flying animals” in the world. They can't see very well. We often hear “as blind as a bat”. Yet they have no trouble flying on the darkest nights and finding their ways round. How can bats fly and see at night? They fly by radar(雷达).

The bat's radar system(系统) works the same way as the radar in ships and planes. As a bat flies through the air, it makes a sound. If the sound hits things, it will come back and the bat's ears will receive the message. In this way the bat is able to know where the things are. Bats go out for food at night. In the daytime they hang in some dark places. Some people think bats are bad animals. In fact they are useful animals.

    There are all kinds of horses in the world. But one of them you can't ride. It doesn't live on land, but in the sea. Its head looks like the head of a horse .So people call it a "sea horse." In fact, The sea horse is a small fish. It likes to live in warm water. A sea horse always stands up in the water when it swims.

    The mother sea horses give eggs, but they put the eggs inside   father's body to keep them safe in its pouch until they hatch()孵化. When the eggs are hatched after 40 to 50 days, the baby sea horses swim away.

根据短文内容，选择正确答案。

    We use the Internet for many things: business, shopping, writing letters, talking to people, finding information and so on. In recent years, a new kind of English has grown on the Internet. There's no real word for it yet, so we'll call it e-talk.

    People don't like typing too much. To save time, they turn phrases into a few letters (called acronyms). Acronyms are often used in chat rooms(聊天室). Some of them are:

    BTW (by the way)                 BRB (be right back)

    LOL (laughing out loud)            IMO (in my opinion)

    People also use many abbreviations. They are shortened forms of words. Some common abbreviations are:

    info (information)                  puter (computer)

    pic (picture)                       sec (second)

    We usually don't see people when we communicate(交流) on the Net, so people have new ways to show feelings. Most people use their keyboards to draw "feelings", such as:

:-) (happy)    ;-)  (joking)   :-(  (sad)       :-O  (surprised)

    These days, many forums (论坛) have picture feelings. For example:

    There are even whole new words, like "newbies"(someone who is new on a chat board or forum). When you write something bad about someone else, it's called "flaming" the person.

    It takes time for people to get used to(适应) e-talk. Also, different groups on the Net have their own special ways of communicating. Newbies sometimes have to ask other people what they mean. As the Internet grows, e-talk will continue to grow and change.

Choose the best answer:

    How do you light up the night sky? The answer is by using electricity. But did you know that nature can glow (发光), too?

    Scientists have found many glowing living things. Most of them live in the ocean. Some use their lights to talk to each other. Others use them to hunt, to mate (交配) or to protect themselves. The vampire squid (幽灵蛸), for example, uses a cloud of light to scare enemies.

    Scientists around the world are looking at this kind of light for new ideas. In 2013, the US company Gleaux said it has created the world's first light-producing plant, the Daily Mail reported. It is a genetically-modified (转基因的) plant. It can glow like a firefly.

    Alexander Krichevsky, the company's founder (创始人), and other scientists hope that in the future, glowing plants could replace lamps and glowing trees could light up highways. Krichevsky also hopes the technology could be used in farming. Farmers could know when their crops need water or are ready to be picked if they glow.

    While Gleaux is working on glowing plants, the French company Glowee is trying to use glowing bacteria (细菌) to light up shop windows and street signs. It's the same type of bacteria that cause a type of squid to light up, New Scientist Online reported.

    "Our goal is to change the way we produce and use light," said Glowee founder Sandra Rey. "We want to help reduce the 19 percent of electricity consumption (消耗量) that is used to produce light.