Traffic lights are red, yellow and green. They are very important signals (信号). Traffic lights are usually placed at busy street corners to help control traffic. Sometimes, they are on streets near schools and shops, too. Most young children are taught what each of the colored lights means, so everybody can stay safe.

The first traffic signals were used for trains. The signals were put alongside railway tracks (轨道). The color red was used to mean “stop” because it warned people of danger. A red light was also the easiest color to see from a distance. Train drivers could see the red “stop” light ahead and had enough time to slow down and stop their trains. A green light was used to mean “take care” and a white light meant “go”.

However, there were many dangerous accidents on the train tracks. Some train drivers thought a star shining in the night sky was a white light that meant “go”. So the signals were swapped. The “go” light was changed to green and the “take care” light was changed to white.

During these times, people travelled by train or in carts pulled by horses. Years later, when cars were built, people began to drive them because they could travel much faster than horses. However, the road rules for drivers were not very clear and many people were hurt crossing the roads. Yellow warning signs had to be placed beside the roads to remind drivers to take care and allow people to cross safely.

Today, towns and cities all over the world have traffic lights. Red and green lights match the signals used on the railways. Yellow lights are easy to see, so they are used to warn drivers that they should slow down and prepare to stop.

   A lot of animals travel from one place to another. We call this migration.

In Africa, large animals, like elephants and zebras, migrate to find food and water. They usually follow the same ways every year.

A lot of birds migrate to find food and better weather, too. They are usually birds that eat insects. They spend the summer in northern Europe, because there are lots of insects there. In the winter there aren't any insects, so the birds fly south to southern Europe and Africa.

Some insects migrate, too. In North America, millions of monarch butterflies fly south to spend the winter in Mexico, California and Florida, where it's warmer. They travel 50-65 km each day and they travel about 1,125 km.

Some fish migrate to breed  (繁殖). Salmon (鲑鱼) can swim over 20,000 km in their life. They are born in rivers in Ireland, Scotland and other places in northern Europe. The young fish swim down the river to the sea and into the Atlantic Ocean. They live in the ocean until they are adults. Then they return to the river where they were born. They lay their eggs in the river and then they usually die. Salmon do this, because their eggs are safer in the river. Other fish can't eat them.

Arctic terns (北极燕鸥) travel the furthest when they migrate. They spend the summer in the Arctic, but when winter comes they fly to the Antarctic, because it's summer there. The next year they fly back to the Arctic again. In one year these small birds travel 36, 000km from one end of the earth to the other and back again. Nobody knows how they do it.

How would you feel if someone decided to take away your park? Well that's what's happening in my community. There's a park that some people want to turn into a golf course   (高尔夫球场). Let me tell you why I think it's a bad idea.

First, a park is meant to be for the whole community. Not everyone likes golf, so not everyone will get to use the park. This isn't fair. A community park should have open spaces for everyone to use.

Second, to make way for the golf course, lots of playground equipment (设施) will have to be moved or knocked down, which is a waste of time and money. It's also a waste of perfectly good equipment. The swings, for example, will probably just end up as litter.

Third, what about giving young people something to do? Not all kids are crazy about golf. At the moment, the park has a skating place and a playground. These attract lots of kids from the community. If you turn the park into a golf course, these kids won't have anywhere to go and they won't have anything to do.

This means that they will stay at home and turn on a video game rather than get some exercise. It also means that they might be out on the street causing trouble. Wouldn't it be better to give them something to do at the park?

Finally, golf is expensive. Building a golf course and maintaining (维护)it costs a lot of money. Who is going to pay to maintain the golf course? What about those people who can't afford to join a golf club? That means that the golf course will only be available to people with lots of money.

Turning our park into a golf course is a bad idea. I suggest we have a community meeting before plans go any further.

A．

B．

C．

D．

16．

Hopes, ambitions (抱负), dreams. How many of yours will you achieve? When you look back at your life in the future, will you have good memories of all the things that you did? Or will you regret all the things that you didn't do?

Of course, there's no easy road to success, but one thing is certain: success won't come if you don't do anything. So how do you do it? This four-step model will help you to make your dreams come true.

Step 1:
17．

What would you like to do? Write down all your ambitions. They may be very general, such as I would like to be fitter. I want to be famous or It would be nice to have more friends. Or they may be more specific, like I've always wanted to play a musical instrument.

Step 2:
18．

Now you need to do two things:

1. Choose one or two ambitions. If you try to do everything, you won't do anything.

2. Set a time limit (限定). This is very important, because you will have a goal and you will also know when you have reached it.

So, for example, I would like to be fitter. in Step 1 now becomes I will be fit enough to join a half-marathon race by the end of August.

Step 3:
19．

Now that you've made your choice, what are you actually going to do to achieve your goal? So, in our example, I will be fit enough to join a half-marathon race by the end of August. becomes I'm going to join a running club. or I'm going to go jogging three times a week.

Step 4:
20．

This is when you change your intentions (意图) into specific actions. Prepare to do something at a specific time. If you don't do this, your dreams and plans will just stay as dreams and plans. So now I'm going to join a running club. becomes I'm meting the president of the Cheetahs Running Club on Monday evening at 5∶30.

Don't let your ambitions die. Follow this four-step plan and make your dream come true.

Eddie was filled with excitement. The mountain bike _______ was about to start and he had been training hard. Perhaps, this year, he would finally _______. The waiting crowd shouted encouragement, and Eddie’s dad was among them, smiling _______.

The starter’s gun _______ and Eddie got away quickly. The road was bumpy(起伏不平) with lots of sudden turns, but Eddie was _______ for these challenges. As he went around a corner, he _______ that his friend Riley was the only rider in front of him.

Putting in more effort, Eddie reached Riley and then suddenly he was _______. He was going to win! Eddie could _______ the finish line at the top of the next hill. The crowd began to _________ and Eddie heard his father’s voice supporting him.

Moments later, Eddie heard a cry. He looked around to see Riley ________ on the road with his bike on top of him. Any minute now, the other ________ would rush toward him over the hill. Eddie jumped off his bike and ran to Riley. His friend was unhurt and the boys __________ moved Riley’s bike off the road.

The other riders ________ past to the finish line, and Eddie heard a cheer go up for the winner. Slowly, Eddie ________ his bike to the finish line. Tears of disappointment filled his eyes. Then, to his surprise, Eddie heard a sound and looked over at the crowd to see them cheering for ________.

And there was his dad, with the proudest smile of all.

A doctor in the family!

After studying for a long time, my brother has now graduated and we are very
36．(luck) to have a doctor in the family! My mom and dad, my sister and I are all interested in arts and languages. No one in the family has ever studied medicine before—it's so difficult and takes such a long time
37．(study). So we're all very proud of him. As well as this, we have a doctor of our own to ask
38． any medical problems we have! How good is that?

I think Micky will make
39． excellent doctor. He's patient and understanding, and he
40．(care) a lot about people. He
41．(help) at car accidents and done some small operations. I admire him very much.

I can't stand the sight of blood, so I could never do what he does!

Micky says he wants to work in hospitals where he can help people with different
42．(ill). Though he knows doctors in hospitals work very long hours, he doesn't mind. In
43．(I) opinion, it's wonderful if you can have a job that you
44．(real) enjoy and Micky has found one. I just hope he isn't
45． busy that the rest of us have to make an appointment (预约) to say hello.

   假定你是李平，请阅读以下邮件并回复。内容包括接受邀请并询问至少三个相关细节（如具体地点……）

注意：1. 词数80左右；2. 可适当增加细节, 以使行文连贯。

Dear Li Ping,

We would like to invite you to give us a talk on Chinese folk music. The talk will be on the evening of Friday, July 10th at 7:00. If you’re able to come, please reply in writing to this invitation by July 2nd. Hope you can make it!

Larry Smith

President of Foreign Students’ Club

Yours,

Li Ping