1.Farmers bartered rice for machinery.

A. exported                                                       B. imported

C. exchanged                                                    D. charged

2. Money is still a major incentive in most occupations.

A. procedure                                                   B. stimulus

C. potential                                                      D. section               

3. For China ’ s newly-rising enterprises, profits are up throughout the region — thanks largely to low wages.

A. products                                                 B. sales

C. bonuses                                                    D. returns                

4. The workers demanded the same wage and the same treatment! There must be no discrimination.

A. distribution                                                  B. prejudice