地漏水封高度不得小于（）mm。 A.40 B.50 C.60 D.70

          My name is Rich. I'm fourteen years old. I'm    1   in a middle school. My school is nice and clean
There are 30 students in my class.  It's   2      today.  My classmates and I are    3    a good time on the
beach. The beach is a nice place.  The water is blue and clear.  Many birds are  4    over the sea. Many
people are 5   .  Some boys are   6   football.  Some people are   7   on the beach. A girl is 8     pictures
on a chair. Another girl is    9   photos.  I'm   10   to you! What are you doing?  I hope you can write to 
me soon.