第一部分：英语知识运用（共两节，满分55分）
第一节：单项填空（共15小题；每小题1分，满分15分）
1.He is working in a factory.It ________ a half year since he ________ a college student.
A．is；was B．has been；become C．is；became D．has been；became
2.________ carefully, the mixture was bitter.
A．Tasted B．Tasting C．Taste D．To taste
