第一节:单项选择(共15小题,每小题1分,满分15分)
21. AIDS is a disease that the body’s immune system.
A. breaks out B. breaks into C. breaks down D. breaks up
22. He urged that much of the poverty .
A. should wipe out B. wiped out C. be wiped out D. had wiped out
23.They paid a visit to used to a factory.
A. where B. what C. which D. that