—— The water changes into thick ice covering rivers and lakes in winter in Harbin.

—— ＿＿＿＿ in Urumqi and children go skating on it then.

A.So is it B.So it does   C.So it is D.So does it

—— The water changes into thick ice covering rivers and lakes in winter in Harbin.

—— ＿＿＿＿ in Urumqi and children go skating on it then.

1. A.
   So is it
2. B.
   So it does
3. C.
   So it is
4. D.
   So does it