The  1  is getting colder, and soon winter  2  shorter. We live in warm houses and we  3  thick coats when we go outside. But 4  do animals stay warm in winter?

Adapt(适应)

    Some animals keep  5  in winter, so they must adapt to the changing weather.  6  warm, they may grow new, thicker fur in  7 autumn.

Migrate(迁徙)

    Some of the animals migrate. That means they travel to other places  8  the weather is warm or they can find food.

Hibernate(冬眠)

    Some animals hibernate for part or  9  of the winter. These animals usually find a cave or a hole under the ground to spend their winter. The body temperature of the animals drops, their heart beats more slowly and they breathe  10  .

    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.

    What do you think of robots? Will they work for humans in the future?  Maybe we can't answer it.But robots have 1 an important part in our daily life for several years .But in some science fiction movies, the robots are just like humans. Now they help humans with the housework and do the most 2 jobs.

    Many scientists believe that there will be such robots in the future.3they agree it may 4 hundreds of years. Scientists are now trying to make robots look like people and do the same things as us.

    But robot scientist James White 5 He thinks that it will be 6 for a robot to do the same things as a person7 it's easy for a child to wake up and know where they are. Mr. White thinks that robots won't be able to do this. But other scientists disagree. They think that robots will be able to talk to people 8 25 to 50 years.

    Robot scientists are not just trying to make robots look like people. For example, there are already robots working in factories. They do many 9 over and over again. People would not like to do such jobs and would get bored. But robots will10 get bored.

    In the future, there will be more robots everywhere, and humans will have 11 work to do. New robots will have many different12. Some will look like humans, and13 might look like snakes. After an earthquake , a snake robot could help look for people under buildings. That may not seem possible now, but computers, space rockets and even electric toothbrushes 14 impossible a hundred years ago. With the 15of science technology. We never know what will happen in the future! Let's work much harder to make robots serve us better!

    Today more and more people live in cities. So there is usually little room in a city to grow food.1of the land in a city is used 2 homes, shops, roads and parks. Most food for city people is grown in the country. It is often brought to the city by3, train and plane. Some food 4 comes into the city by car.

    Water is5 thing that cities get from the country. Everyone needs water every day. We use a little of it for6, but we use even more to 7bathtubs(浴缸) and wash streets.

    The water used in cities comes mostly from the rain. But people8use the rain that falls on cities. The rain becomes dirty as it falls through dirty air. Once it hits city buildings or streets, the rain will pick up more dirt. It is not good for drinking or bathing.

So cities must reach out to the 9 country for water. There the rain falls through air onto trees and grass. The fallen rain runs 10 rivers and lakes. So it is important to keep both cities and the country clean.

    My name is Miranda Gibson. I have been at the top of a tree for five months now. Some people might wonder 1 on earth I would choose to do that.

    I have walked 2 this forest many times. On 12 December 2016, machinery (大型机械) rolled into the forest and the destruction (摧毁) began. I couldn't bear (忍受) the thought that these forests would be 3 forever. So, on 14 December 2016, I put my clothes into a bag, 4 my job plans, and climbed 60 meters to the top of this tree. I have been there ever since.

    Life in the tree tops can be challenging. I have times when I feel frustrated (沮丧的) and I wish I could 5 to have a holiday for a few days! There are times too, when I feel terribly 6. I miss my friends and family.

    Living on the tree has been exciting and encouraging. I am willing to 7 up here for a long time, 8 I honestly hope it won't be too 9 before I can put my feet on the ground below and stand in a forest that will never 10.