Many people dream of going on a challenging travel. Most of them keep dreaming; others make it happen. Gregg Bleakney dreamed of going bike riding from North America to South America after finishing a pleasant bike ride. So did Gregg's friend, Brooks Allen.

To pay for the trip, the two friends worked for years. When they were on the road, they often camped outdoors or stayed in cheap hotels. In many places, local people opened their homes to the two friends and gave them food.

During their trip, Gregg and Brooks rode through deserts, rainforests and mountains. They visited modern cities and ancient buildings. On the way they met other bicyclists from all over the world. Brooks had to return to the USA near the bottom of South America and Gregg continued without him. In May 2007, Gregg finally reached his goal. He traveled twelve countries and finished the 30,500-kilometer trip.

Gregg and Brooks kept a record of their trips in a blog. The trips taught both men a lot about traveling. Here is some of Gregg s advice:

Travel light. The less baggage （行李） you have, the less you'll worry about.

Be flexible . Don't plan everything. Always be ready for something unexpected. Then you'll be more relaxed and happy, even when there are challenges along the way.

Be polite. As one traveler told Gregg, "Always remember that nobody wants to fight or cheat a nice person."

Anything worth doing requires time, energy and action. There is no exception. If you hold on to your dream, you can make it like Gregg and Brooks and have fun while you're at it.

根据短文内容，选择最佳答案。

41 ． How did Gregg and Brooks travel from North America to South America?

A．

By bike.

B．

On foot.

C．

By bus.

D．

By car.

42 ． Why did the two friends work for years before their trip?

A．	Because they wanted to buy new cars.
B．	Because they wanted to get experience.
C．	Because they wanted to make money for the trip.
D．	Because they wanted to make more friends.

43 ． What happened during the trip to South America?

A．	Gregg and Brooks often stayed in expensive hotels.
B．	Brooks had to return to the USA when in North America.
C．	Both Brooks and Gregg finished the 30,500-kilometer trip.
D．	Gregg and Brooks met other bicyclists from all over the world.

44 ． What do the underlined words "Be flexible" mean in the passage?

A．	Be careful when you travel.	B．	Be worried about the baggage.
C．	Be patient with other travelers.	D．	Be able to change to suit new situations.

45 ． What's the purpose of the writer in this passage?

A．	To introduce a country in South America.	B．	To help people learn to make a travel plan.
C．	To encourage people to achieve their dreams.	D．	To show the friendship between the two bicyclists.