Have you ever seen a car without a driver? It sounds crazy, but these computer-driven driverless cars will soon be filling roads near you. Companies like Google and Tesla have been designing and testing these cars, and the technology is there.

    So how? The cars have sensors（感应器）all around which can find other cars and objects in the road. Road signs are read by cameras, and satellite navigation systems（卫星导航系统）are used so the car knows how to get where you want to go. All you have to do is type in the address! Finally, a central computer system takes in all the information that it receives from the sensors and cameras and works out when to speed up, stop and turn.

    Sound like your idea of heaven（天堂）? Sitting back, looking out of the windows and even watching a film or reading a book while ‘driving' would be possible with this new technology. You wouldn't have to worry about remembering directions to where you're going. In addition, computers would also drive more safely than people — they would obey the rules and have quicker action times when in dangerous situations.

However, there are many drawbacks of driverless cars. Computers would have difficulties making ethical（道德的）decisions: if a child ran into the road, would the computer choose to hit the child or turn suddenly and potentially kill the car's passengers? Moreover, I personally find driving fun –I'd miss never driving a car myself. There would also be many other decisions to be made –should children, or drunk people, be allowed in a driverless car by themselves? Or would there need to be a person with a driving license in the car at all times?

    I'm not certain I'd want a driverless car – but it's only a matter of time before they'll become more affordable and popular on our roads.

从小学到初中，增加了新的学科，那么，你最喜欢的学科是哪一门呢？请以" My favorite subject"为题，介绍一下你最喜欢的学科！短文必须包含以下的内容。

1.What's your favorite subject?

2.Why do you like it？

3.When do you have your favorite subject?

要求：

1.条理清晰，意思连贯，语句通顺，标点正确，书写清晰、规范；

2.文中不能出现自己的真实姓名和学校名称；

3.60 词左右。

My favorite subject

……

Being street smart is an important skill to have and a good way to take care of yourself.

Always carry your phone with you, but do not look at 1 while you are walking. Being able to communicate(联系;交流) or call for help is important, so keep a list of useful numbers. But put your phone away while you are walking so that you can keep your 2 up and see what's going on around. If you do need to check your phone, 3 and look at it quickly.

Don't wear earphones 4 you are out. If you have to 5 something when you' re out, use only one carphone or play it at a very low volume(音量).

Travel with 6 or family members when possible and never go anywhere with a stranger. It's 7 to be careful with strangers. Remember not to get into a stranger's car if he calls you over.

8 dark and out- of- the- way places. Do not take short cuts through dark areas, even if it will make your trip much faster. If you have to go to unsafe places, go 9 some one you know or speak to someone over the phone while you are there.

Run and shout if you feel unsafe. Run away as fast as you can towards a police station, hospital, or nearby business for 10 . Shout as loudly as you can to get the attention of people nearby.

Near the North Pole(北极) there are only two seasons: winter and summer. 

{#blank#}1{#/blank#} For over two months you can't see the sun, even at noon. In summer, days are long. {#blank#}2{#/blank#} The temperature is very low near the North Pole. Even in summer the temperature is below 0 ℃.  {#blank#}3{#/blank#}  They make their clothes from the skins(皮) of animals. From the skins they also make hats and shoes.

It's very cold, so people there have to build their houses with skins or snow. 

{#blank#}4{#/blank#}

When they move, they take their tents with them. Sometimes, they build houses of snow. But don't think that these houses must be cold. {#blank#}5{#/blank#} The life near the North Pole is very interesting.

Our nearest neighbor is the moon. In the sky, the moon and the sun seem to be of the same size because the moon is much nearer.

The moon makes the tides(潮汐)— the changes in the level of the sea. The moon and the sun together pull the sea. In some parts of the world, the difference between" high tide"( when the sea is very near the land) and" low tide"( when the sea is far away from the land) is very big. This is very important for ships.

The moon is very different from the earth. Gravity(重力) on the moon is six times weaker than that on the earth. There isn't any air. During the day, it is very very hot but at night it is very very cold. Nothing can live on the moon.

If the moon goes between the earth and the sun, we have an eclipse of the sun(日食). The moon stops the light from the sun and we have night in the day.

If the earth goes between the moon and the sun, we have an eclipse of the moon. The moon goes into the shadow(影子) of the earth and it disappears(消失) for a few minutes.

Some problems are difficult to solve in our life. However, there are a lot of number expressions （表达用语） that can help. Today, let me show you some examples. 

Sometimes we can "Kill two birds with one stone". That is to say, we can complete two goals （目标） with only one effort or action. But we must remember that "two wrongs don't make a right". If someone does something bad to you, you should not do the same to him. 

When I was a young child in school, my favourite subject was Maths. My teacher used to "give me three cheers" when I did well in Maths, praising （赞扬） my hard work and good grades. 

When I was in high school, some of my friends once had trouble doing their schoolwork. In fact, they did not care if they could finish high school. But it seemed that they really got a surprise when they completed their studies and graduated （毕业） from high school. They were "on cloud nine". 

"Nine times out of ten", students who do well in school often find good jobs. Some people work in an office doing the same things every day at nine-to-five jobs. However, it's good to know that happiness at work isn't just about money.