一 选择
1. – Isn’t the girl who talked to you kindly your sister?
–            . She is my English teacher.
  A. Yes, she isn’t       B. No, she is     
C. No, she isn’t        D. Yes, she is
2. When and where to go for the holiday __________ yet.
   A. are not decided            B. have not been decided
   C. is not being decided        D. has not been decided
3. Now day breaks, ________ the birds are singing.
A. because      B. for       C. since        D. as
4. Pandas will __________ if we continue destroying ecosystem(生态系统).
   A. die of    B. die away         C. die from      D. die out