Going to the zoo is very popular. Every year over 134 million visitors go to zoos to enjoy watching and learning about the animals. Zoos are the only places that most people will ever meet an elephant, a tiger or other animals that are in danger. {#blank#}1{#/blank#}. They help us to enjoy different kinds of animals as well as make us think more about nature(自然).

   Zoos are also important to animals. In order to make more space(空间), food, and other things for ourselves, we leave less and less room for animals. {#blank#}2{#/blank#}. If there were no zoos, more animals in the world would have gone extinct(濒临灭绝). {#blank#}3{#/blank#}. Some people think that animals should not be kept by people for any reason(原因). If they become extinct, then that's the way it should be. {#blank#}4{#/blank#}. We should do everything we can to protect them(保护它们).
{#blank#}5{#/blank#} What's the best title of this passage?

    There are over 37 000 known kinds of spiders（蜘蛛）in different shapes and sizes in the world. The largest spiders live in the rain forests of South America and are known as the "bird-eating" spiders. These spiders can grow up to 28cm long and they eat small birds. The smallest spiders are from Western Samoa. These tiny spiders are less than 0.5mm long. They live in the plants that grow on mountain rocks.

    Some people like to keep spiders as pets but most people don't like touching them. A great number of people are afraid of them mainly because of their poison—something will make them hurt or even die. But in fact, only thirty kinds of spiders are very dangerous to humans. Spiders provide benefits for humans by catching and eating insects such as flies and mosquitoes (蚊子).

    Spiders are different from other animals because they make webs to catch the small insects for food. The special silk of a spider's web is light and strong—five times(倍)stronger than steel. Some people have tried to raise spiders in order to collect their silk but no one was successful in doing it. One reason is that it takes 670 000 spiders to produce half a kilo of silk and all of these spiders need living insects for their food. Besides, spiders are usually solitary (独自的) animals and they need keeping alone.

    All in all people are amazed to learn that there are so many secrets in spiders!

    If you have your own Acme Rocket Launcher, you can create and send up rockets that show off your personality and creativity.

    All you need is your Acme Rocket Launcher and a few simple household materials:

    ★a 500ml plastic cola bottle     ★scissors     ★colored markers

    ★poster board     ★glue

What to do:

Step 1     Clean the cola bottle completely and allow it to dry.

Step 2     Use markers to draw three small triangles (三角形) and one large triangle on the poster board. Cut out the triangles.

Step 3     Roll (卷起) the large triangle so that two of its sides touch and it forms a rocket's nose cone. Glue the sides of the cone so that it holds its shape.

Step 4     Glue the nose cone to the bottom of the bottle to make the top of the rocket.

Step 5     Glue the smaller triangles to the other end of the cola bottle, around its opening. The triangles will be the tail fins.

    Follow the launching instructions included with your Acme Rocket Launcher and have a blast!

    Some of the greatest problems we face today are the destruction (破坏) of our environment. Brown clouds, polluted water, endangered wild animals…. these problems seem so huge.

    So my family does what we can. We take cloth bags to stores instead of using plastic bags. We walk where we don't have to drive…

    But does it do any good? When I am the only one in line at the market with cloth bags, am I doing any good? Does my walking to stores make any real difference to the world?

    I recently learned something about flamingos(火烈鸟) which like to get together in groups of a thousand or more. Every year, when the time comes for migration(迁徙), a few of them first take off from the lake. But none of the others seem to notice. So the small group returns. However, the next day they try again. This time a few more fly along with them, but most of them still pay no attention, so they return again. They try for several times. Every time a few more birds join in but, since thousands of the others still take no notice, the great migration plan is once more stopped.

    Then one day something changes. The same small group of birds once again starts flying and a small number more join in just as before, then more. Finally, they all take flight and the migration really begins. What a spectacular sight it must be — thousands of flamingos taking off into the sky at once!

    A few can make a difference. Even if you're the one to take the first step, and continue trying, others will someday take notice and together we will solve even our greatest problems.