The US singer Barbra Streisand loses her pet dog. She loves her dog so much and can’t forget it. So she takes $50,000 out to clone（克隆）her dog. Barbra is not the only one. Now there are a lot of people having the same choice because they want to have their pets again. Any pet keeper can clone their pets when they have about $50,000 or more. But is cloning pets really a good idea?

It’s not easy to clone a pet. It needs the help of a mother pet. First, people take some cells（细胞）from a pet. Then they get some cells from the mother pet. After that, people take the cells of the two pets back to the mother pet. A new pet will come to life 60 days later.

But some scientists don’t think pet cloning is right. They say that if people clone their pets, they will never have new ones. Now lots of dogs and cats are there for a home. Pet cloning is really unnecessary（不必要的）.

It’s true that someone is selling a dream of never having to leave pets. But this is not a healthy dream. The cloned pet looks like the old pet, but it is a new pet. It needs all your love, not part of it, and not from the old dog. So why not just show love to a usual pet?

Here is a page from a magazine called Future. Read the following information about things that may happen in twenty years.

Cars will run on solar power (太阳能) and will be much cleaner and safer. For example, if you are too close to another car or if you are driving dangerously, your car will slow down or stop by itself.

New cities will have to be built in the sea. Some cities on water will have two levels (层). People will live on the upper level, and the lower level will be used for traffic, shops and factories.

Biotechnology (生物技术) will make food better and healthier. Plants without insects or illness (病虫 害) will be developed. The taste of fruit and vegetables will be better and food will be kept longer.

Many new ways to cure (治愈) illnesses will be found. People will use new products (产品) to cure more illnesses. However, some new illnesses will appear.

Drones (无人机) are like planes, but come in many shapes and sizes. They have no pilots and are controlled from outside the drones. During these years, they have been used to attack (进攻) enemies or move goods (货品) in dangerous areas.

Now small drones are a part of people’s lives. For example, people use drones to take photos or make videos. Besides, a drone delivery (投递) service has proved (证明) successful.

Online store JD can use drones to deliver small packages (包裹). It has built several drone stations so that it can load (装载) and deliver its packages.

Drones have made our shopping experience different. We can order a new coat in early morning and it will be delivered before we finish breakfast.

Bizzby Sky, a UK company, has created a delivery service for small goods. Open a smartphone app, enter your address, set a time and pay enough money for the delivery service. Then in minutes, a drone will do tasks for you.

However, any drone company needs government permission (允许) to fly its drones in many countries. We believe we will see more and more drones with goods fly in the sky very soon.