下列哪项是生物多样性中最直观的体现（  ）

    Plants are very important living things. Life could not go on if there were no plants. This is because plants can make food from air, water and sunlight. Animals and men can't make food from air, water and sunlight. Animals get their food by eating plants and other animals. Therefore, animals and men need plants in order to live. This is the reason why we find so many plants around us.

    If you look carefully at the plants around you, you will find that there are many kinds of plants. Some plants are large while others are small. Most plants are green.

    Some plants have many small leaves. Others have only a few. There are many kinds of leaves. Leaves are of different shapes and colors.

    Leaves are also different in other ways. Some leaves have long thin parts at the end, we call them leaf stalks, some have short leaf stalks, others even have no leaf stalks. The leaf edges are also different. Some leaves have smooth(平滑) edges. Some have a wave-shaped edges. Others have edges like the teeth of a saw(锯子).

下列说法正确的是（　　）

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    Do you know how to make friends with a group of people? Let me tell you something about ____ friends with the group. Maybe it's helpful to you.

    First you need to know what kind of group they belong ____ If people in the group are shy, never ____ them “Why don't you talk?”, ”Why are you quiet?” or “Why do you look shy?” They don't like such ____

    Next, remember that each group is different. They may use.____ words, like different things or have different ways of “hanging out”.

    Then ,the important thing is that you must try to be outgoing.____you are outgoing, you will become very popular. Remember,____wants to make friends with a quite shy person.

    Finally, find a right topic to talk ____others or the one you want to make friends with. For ____you can talk with them about the weather, their hobbies or their school lives.

    If you do all these above, you will make more friends and get____well with them.