1 . Earth Hour is organized by the World Wide Fund for Nature. It's a big event usually at the end of March every year. On this evening, people “go dark”.     1    

It's true that turning off lights for just one hour saves only a small amount of power.    2    On one level, joining in Earth Hour makes people think about the problem of climate change and what we can do in everyday life to protect nature.

But on another level, a large number of people’s acting together sends a powerful message to governments and companies.     3     They begin considering green issues when big decisions.

The logo(标识) of Earth Hour is “60+” .The number 60 is for the 60 minutes of Earth Hour.     4     In fact, people who join in Earth Hour say that taking part makes them want to do more for the environment.

    5     Musicians give concerts by playing acoustic(原声的) instruments instead of electric ones, and using candles instead of electric lights. Celebrity chefs have created special recipes for families to prepare and eat by candlelight. Tree-planting sessions, group walks and runs are also among the options.

A．But this is only the beginning.

B．Earth Hour represents every hour of every day.

C．After all, everyone has to answer for what they have done.

D．Besides turning off the lights, people get involved in other events.

E．It pushes them to take urgent measures by making changes to policies.

F．That is, they switch off all unnecessary lights at the same time for one hour.

G．The plus invites people to continue their action even after Earth Hour is finished.

2 . Peter and Cheryl Pitzer met in 1999. After training together, they fell in love and finally married in 2011. The Pitzers have been using their professional aviation skills to help people around the world regain sight. They are both volunteers for Orbis, a non-profit organization that turns airplanes into teaching hospitals and brings eye care and ophthalmology (眼科学) training to places around the world. The organization’s Flying Eye Hospital that the Pitzers fly together is an ophthalmic teaching hospital on board an MD-10 aircraft.

The Pitzers flew their first flight together with Orbis in November, a journey that took them from Dubai to Saudi Arabia and finally to Ghana, a country in West Africa. The couple stayed an extra week after landing the plane in order to be on the ground to help other Orbis volunteers treat people in need, and to train medical staff in the community. “There was a woman named Mary. When we met her on Monday she was almost completely blind and when we left she could see,” recalled Peter.

“They also did surgeries in the local hospitals with the local doctors and their equipment, and they provide continuing education afterwards,” Cheryl said of the team’s work in Ghana.“The idea is to leave the knowledge behind so that people will have access to proper eye care after the plane is gone.”

The couple say they are grateful to share an occupation that they love-one they can do together and that allows them to give back. “It's awesome to see so many people in poverty regain sight. Our work is worth it,” said Peter. “Cheryl and I have a great personal and working relationship. It's just an interesting and incredible way to give back.”

Cheryl noted the intense (紧张的) planning and coordination it takes to fly a major plane carrying a teaching hospital to remote locations. She said she and her husband have an advantage with that complex task because they “understand each other.”

1. What are Peter and Cheryl Pitzer by trade?

A．They are doctors.	B．They are pilots.
C．They are physicians.	D．They are teachers.

2. What do we know about Flying Eye Hospital?

A．It is a mobile teaching hospital.

B．It is a modern general hospital.

C．It is a private hospital in Dubai.

D．It is a famous hospital in Africa.

3. Flying Eye Hospital is intended for__________.

A．the wealthy	B．the poor
C．the disabled	D．the wounded

4. What does Peter think of his volunteer work?

A．It is tiring.	B．It is boring.
C．It is rewarding.	D．It is upsetting.