Bird flu (禽流感) is a kind of serous            in the world today.

A. disease    B. pain    C. patients    D. medicine

The bird built ________ nest in the tree．

1. A.
   it's
2. B.
   her's
3. C.
   hers
4. D.
   its

A bird is different ________ a cat.

1. A.
   to
2. B.
   with
3. C.
   from
4. D.
   of

________a bird, ________name is Polly.

1. A.
   It's, its
2. B.
   Its, it's
3. C.
   It's, it
4. D.
   It's, it's

A bird is as ________ as a fish.

1. A.
   more interesting
2. B.
   interesting
3. C.
   the most interesting
4. D.
   the more interesting