A
Could cities that float on the sea solve the problems caused by floods and provide food for the world?
Some scientists think so. The idea is already being tested and they believe that floating cities will provide more homes for a growing population, without having to use land needed to grow food. And they believe floating areas will allow more food to be grown，so that no one in the world is in hunger.
In some places, cities that float on the sea are already being planned. A company in the Netherlands called DeltaSync thinks that sea cities will save the world，with more than one in ten people living in them.
They say sea cities can solve many of the problems the world faces in the 21st century, like not having enough land, more and more people needing homes, fossil fuels (矿物燃料）running low and the increasingly serious problems caused by floods.
DeltaSync says building in the desert is not possible because there is no enough water and that developing ways for people to live in space is still too expensive. So they believe the answer is our oceans, which cover over two-thirds of the Earth’s surface. Their plans for floating areas include using algae (藻类）to produce fuels and food.
More than a quarter of the land in the Netherlands already lies underwater and scientists there have spent years trying to find ways to deal with it. In the city of Rotterdam they already have floating homes.
Bart Roeffen from DeltaSync says, “We have plans for neighborhoods including roads and, in the end，I believe we can build floating cities on the sea.”
21. DeltaSync is a company that wants to build cities ___________.
A. on land B. in space C. on the sea D. in the desert
22. Which of the following is the advantage of the cities that DeltaSync wants to build?
A. Providing more jobs for people.
B. Making travel in space possible.
C. Supplying enough water to people.
D. Satisfying more people’s housing needs.
23. What does Bart Roeffen think of his company’s future plans?
A. He doubts them.
B. He is hopeful about them.
C. He is uncertain about them.
D. He has no idea about them.
24. What is the best title for the text?
A. Will there be enough water?
B. Will sea cities save the world?
C. Is it possible to live in the desert?
D. Is it expensive to build floating cities?
