Read the passage and choose the correct answer A, B, C or D for each of the following questions

Read the passage and choose the correct answer A, B, C or D for each of the following questions.       

       Natural resources are the useful things that occur naturally in the environment. Some examples are oil, water and trees. Humans use natural resources for every part of their lives, so we all must be careful to use them wisely.  

 Resources can be divided into renewable and non-renewable resources. The difference is whether the resource recovers naturally over time. Renewable resources are usually living things like animals or plants. For example, trees are a renewable resource because they grow soon again after we cut them down. But oil is a nonrenewable resource because it takes millions of years to form again. We must try to save the nonrenewable resources because once they are used up, we cannot get more. Natural resources can be traded between countries. They can create a lot of wealth for resource rich countries. For example, Saudi Arabia, Iran, and Kuwait in Middle East have a large amount of petroleum. They export it to other countries and make good money.  

33. What is the main idea of the passage? 

A.   Different resources can be sold to other countries for money.  

B.   Natural resources are important for us, so we must save the ones that are limited. 

C.  There are resources we do not know about.             

D.  Most poor countries do not have many resources.  

34. How many types of natural resources can we divide? 

A. two                     B. one                C. many            D. renewable and non-renewable  35. What is the matter with nonrenewable resources?  A. They are expensive.     B. They make good money.                

C. They are used up.        D. It takes millions of years to form them.

A.   Because there isn't any left.                                         

B.   Because it takes millions of years to form again.

C.  Because we can't use it any more. 

D.  Because we can get more resources if we use them all.  

37. The word them in paragraph 1 refers to: 

 A. humans            B. their lives             C. some examples            D. natural resources