A．The risks and potential rewards of the products. 
B．The different kinds of investments.  
C．The importance of investments.            
D．The sum of investments.

A．It is a place full of risks.           
B．It is a good place to invest in.          
C．It has up times as well as down times.                 
D．It has more up times than down times.

A．To find out if she has the flu.        
B．To find out how to maintain a nutritious diet.         
C．To find out how to prevent illness.
D．To find out the results of a blood test.