Ⅰ.单项选择。(30分)
1. ---What _____ useful book! And ______ book is popular with students.
A. a, a B. a, the C. the , the
2. — Jane, is this your dictionary?
— Yes, it's . Thank you.
A. me B. my C. mine
3. --- What’s the number of students in your classroom?
---It’s about fifty. __________ of them are girls.
A., Two third B. Two thirds C. Second third
