Natural resources are things that we use that come from Earth.  Out natural resources are limited(有限的). This means that they will not1 forever.

    Some are renewable, like when you plant a new tree when you2one down. Others are not renewable, like when you dig coal out of the 3.Once it is used, it is gone. People realize the4that Earth's natural resources are limited, and can do things to help save those resources.5you try to save a natural resource, you try to use less of it, so it does not run out so 6 One way that people save fuel, like gasoline, is by riding a bicycle or walking when the 7is short instead of driving everywhere. Water is a very important natural resource because we all need it to stay8. We can keep water9making sure that our pipes and taps do not leak(漏). We can also make 10 choices to save water, like only using the dishwasher or washing machine when they are full.

    Everyone can make contributions to protecting natural resources.

中共十一届三中全会后，我国农村实行家庭联产承包责任制，相对于1958年的人民公社化运动，其进步性最主要在于（    ）

扬声器是把电信号转换成声信号的一种装置，如图所示是扬声器构造示意图。当线圈中通过变化电流时，线圈受到____力作用，从而带动与线圈相连的纸盆____，于是扬声器就发出了声音。

    Hello! My name is Wendy. I live in the city. My family doesn't have a car, so I go to school on the bus. There are four people in my family. They are my parents, my brother and I. We live happily together.

    At school, I study very hard. I am very good at English. I often help my classmates with their Chinese and English. I enjoy learning.

    I am a quiet girl. I like reading and listening to light music. I have some friends. We always spend time together, they are very funny and friendly. I wish we can be friends forever.