I am sure you have heard about global warming. Global warming may make the sea level become higher. Do you know why? It is because global warming causes the earth to be warmer and this in turn makes glaciers melt.

What is a glacier? It is a large sheet of ice that moves very, very slowly. Some melting glaciers add more water to the ocean. Higher temperatures also make water expand. When water expands in the ocean, it takes up more space and the level of the sea rises.

Coastal flooding could cause salt water to flow into areas where salt is harmful threatening,

plants and animals in those areas. Leaders of all nations around the world are in the fight against global warming but “change only happens when individuals take action”.

Question 21. Global warming may make the level of the sea become _ .

A. lower                          B. higher                         C. warmer                       D. hotter

Question 22. How fast does a glacier move?

A. Very fast.                   B. Very quickly.             C. Very rapidly               D.Very slowly

Question 23. Why does water expand, according to the passage?

A.  Because of higher temperatures.

B.  Because of leaders of all nations around the world.

C.  Because of individuals.

D.  Because of plants and animals.

Question 24. What will be threatened if salt water flows into areas where salt is harmful?

A. Glaciers in those areas.                                      B. Rivers in those areas.

C. Buildings in those areas.                                    D. Trees and animals in those areas.

Question 25. Which of the following statements is NOT TRUE, according to the passage?

A.  Water expands because of higher temperatures.

B.  Global warming may make the sea level become higher.

C.  A glacier is a large sheet of ice that moves very fast.

D.  Leaders of many countries in the world are fighting against global warming.