[D] it is cute and friendly.
22. How were the monkeys introduced to the idea of a cash economy?
[A] They were told that metal discs could be traded for food.
[B] They were given metal discs if they gave the researchers food.
[C] They were shown the different values of three different kinds of food.
[D] They were given some discs which researchers would exchange for food.
23. The researchers reduce the “cost” of apples in order to_________________
[A] see if the monkeys would “buy” more apples, as humans would.
[B] see if the monkeys understood the idea of a cash economy.
[C] see if the monkeys preferred apples or another kind of food.
[D] see what the monkeys would buy with only nine metal discs.
24. The first trading regime mentioned in the final paragraph revealed that ___________
[A] monkeys don’t mind being deceived.
[B] monkeys like to take risks.
[C] monkeys don’t really understand the concept of a cash economy.