题目内容：

    In 2005, Winston Duncan was traveling with his mother in Southern Africa when he saw an old lady and young boy walking down a road together. He thought of his own grandmother and wondered how he could help the old lady and others in Africa who have to walk a long way.

Duncan, who lived in Washington State was 10 at the time, and his solution was to give them bikes. With his mom, he started Wheels to Africa, an organization that for the past 14 years has taken bicycles donated from residents of the. Washington area and shipped them across the world to people in need.

Most of the 8000 bikes they have collected have gone to countries in Africa, helping cut down hours of walking for students and other postmen. But last week, Duncan, travelled with a handful of volunteers and 400 bikes to a destination much closer to his home yet still in need: Puerto Rico. More than a year after it was destroyed by Hurricane Maria, the island suffers from transportation problems.

"It was a little chaotic (混乱的) — as soon as they got their bikes, they were just having fun riding around the parking lot," said Austin Higgins, a New Jersey resident who recently joined Wheels to Africa as its photographer and videographer. "Some people who received bicycles were almost speechless, and some of them cried, because it was something they had requested for Christmas from Santa Claus," he said.

The donated bikes included some high-end racing models, which went to teenagers interested in pursuing serious cycling.

Duncan recently graduated from Bard College and is in Arlington working at a political consulting firm. He now encourages kids in the Washington area to get involved with the organization, and some have joined him on trips to Africa and on this trip to Puerto Rico.

"I wanted to try to get people to think about giving back,” he said.

1.Why did Winston Duncan start Wheels to Africa?

A.He hoped to make his grandmother feel happy.

B.He was fond of collecting different types of bikes.

C.He wanted to help the poor people to live better.

D.He was greatly supported by his mother to do so.

2.What can we learn about Wheels to Africa?

A.It has been managed for fourteen years.

B.It has delivered about 400 bikes to Africa.

C.It has many young kids as its members now.

D.It collects bicycles from all the areas in the U. S.

3.What can we infer from Austin Higgin's words in Paragraph Four?

A.The delivery usually meets with some trouble.

B.The people who got bikes were excited and grateful.

C.It was very difficult for Duncan to collect enough bikes.

D.People in Africa required him to dress up as Santa Claus.

4.What is probably the best title of the text?

A.Wheels to Africa. B.Trip to Puerto Rico.

C.Duncan, a Generous Person. D.Hurricane in Puerto Rico.