1 . Pollution is one of the biggest problems in the world today. In many places, rubbish is thrown into lakes and rivers.     1    

In some cities, the air is filled with pollution.     2     If it is not cleaned up, more people will be hurt.     3     Land and water pollution kills many animals every year.

If we do not act to improve the environment, more living things will be killed by pollution.

    4     We should separate rubbish into different groups. In this way, it can be recycled and reused. We had better plant more trees.     5     What’s more, we shouldn’t put the waste into lakes or rivers.

If we can do these, we will make the world a better place to live in.

A．This makes some old people and children ill.

B．As well as people, animals are also harmed by pollution.

C．We can make our lakes and rivers cleaner and cleaner.

D．It’s time for all of us to take action right away!

E．Because of this, these places have already been polluted.

F．Trees reduce dust and help keep the air clean.

G．A few of us should take action to protect the environment.

2 . In south Africa’s Limpopo province, a baobab tree (猴面包树) once grew so large and stood so strong that its human neighbors decided to build a pub inside the living tree’s thousand-year-old hollow trunk(树干). For 20 years, “The Big Baobab Pub” attracted tourists all over the world. But in August 2016, one of “the walls” broke. Eight months later, another huge piece broke, too. Now, five of the giant stems have collapsed and died, leaving only half of the tree standing.

Though it could sound like a result of human visitation, it's part of an alarming trend: many of the oldest, largest baobab trees in Africa have died within the last 12 years.

Stephan Woodbourne, an African scientist, said: “Of the oldest trees that we’ve looked at in Southern Africa, the three trees that are older than 2,000 years have all died in the past 10 years. Of the 11 trees that are 1,000 to 2,000 years old, six of them have died.”

A report published in the journal Nature Plants claims scores of the ancient baobab trees, some of which are up to 3,000 years old, are now dying because of rising global temperatures.

Researchers believe it is impossible that such a high number of old baobab trees die in such a short time due to natural causes. They think it may be associated with huge change of climate conditions that affect southern Africa in particular.

1. What has happened to The Big Baobab Pub?

A．The pub has largely been destroyed.

B．More tourists from the world visit it.

C．The pub has a long history of 2,000 years.

D．The Baobab Tree grows larger and stronger.

2. The paragraphs from 2 to 4 mainly tell us that ________.

A．all the oldest baobab trees have been dead

B．the oldest baobab trees will die out soon

C．ancient baobab trees are in the face of danger

D．Human’s visits lead to ancient baobab trees’ deaths

3. What is probably the main reason for the trees’ death?

A．Many pubs’ foundation.	B．Global climate changes.
C．Human visitation.	D．Natural causes.

4. What’s the best title of the passage?

A．Research on Baobab Tree.	B．Facts about Baobab Tree.
C．Baobab Tree in Africa.	D．Tree of Life is Dying.