听下面一段材料,回答第1至4题。 1. What position does Helen apply for? [ ] A. Library assistant. B. Language assistant. C. Assistant manager. 2. How long did Helen do part-time jobs? [ ] A. Three months. B. Five months. C. Eight months. 3. What did Helen use a lot in high school? [ ] A. Cassette recorders. B. VCDs. C. CD-ROMs. 4. How much can Helen earn every day if she takes the job? [ ] A. 15 dollars. B. 30 dollars. C. 50 dollars.