Great Barrier Reef The Great Barrier Reef is in the northern part of Australia. It is the largest coral reef system（珊瑚礁系统）in the world. Great Barrier Reef has over 900 islands and over 2,900 reefs. It is larger than the Great Wall of China. And it is the only living thing on Earth that can be seen from outer space.

Harbour of Rio de Janeiro The Harbour of Rio de Janeiro is around Rio de Janeiro, Brazil. It is famous for being the world’s largest bay（海湾）. The harbor is 17.4 miles long from east to west and 18.6 miles from north to south. It was first discovered in 1502.

Paricutin Paricutin is a volcano that is in the Mexican state of Michoacan. It is one of the youngest volcanoes in the world. It last erupted（爆发）in 1952.

Victoria Falls Victoria Falls is a waterfall system on the Zambezi River in southern Africa. It is neither the highest waterfall nor the widest waterfall in the world, but it is the largest. It is 1,708 metres wide and 108 metres high.

【小题1】Which of the following is TRUE about the Great Barrier Reef?

A．It is the oldest coral reef system in the world.	B．It is made up millions of reefs.
C．We can see it from outer space.	D．It is as long as the Great Wall.

【小题2】What can we learn about the Harbour of Rio de Janeiro according to the material?
① When it was first discovered.          ② Who first discovered it.
③ What it is famous for.               ④ Where it is.

A．①②③ .

B．①③④ .

C．①②④ .

D．②③④ .

【小题3】When did Paricutin erupt last time?

A．In 1502.

B．100 years ago.

C．67 years ago.

D．In 1708.

【小题4】Which of the following words can describe Victoria Falls?

A．Highest.

B．Oldest.

C．Widest.

D．Largest.