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Polar bears live mostly on_____ sea ice, which they use as ____platform for hunting seals.

A.     a;a  B.a;the  C./;a  D.the;/

Polar bears live mostly on_____ sea ice, which they use as ____platform for hunting seals.

A.     a;a  B.a;the  C./;a  D.the;/

Polar bears live mostly on_____ sea ice, which they use as ____platform for hunting seals.

A.     a;a  B.a;the  C./;a  D.the;/

Polar bears live mostly on______ sea ice, which they use as ______platform for hunting seals.

  A. a; a          B. a; the        C. 不填; a           D. the; 不填

Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.

A. a; a      B. a; the      C. 不填; a      D. the; 不填

Polar bears live mostly on _____ sea ice, which they use as ___ platform for hunting seals.

   A. a; a       B. a; the     C. 不填；a    D. the; 不填

Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.

A. a; a      B. a; the      C. 不填; a      D. the; 不填

Polar bears live mostly on __________ sea ice, which they use as __________ platform for hunting seals.

A. a; a     B. a; the

C. 不填; a      D. the; 不填

Polar bears live mostly on_______sea ice,which they use as_______platform for hunting seals.

A.a;a                                                               B.a;the

C.不填;a                                                         D.the;不填

 Polar bears live mostly on ________ sea ice, which they use as _______ platform for hunting seals.

   A. a; a            B. a; the           C. 不填; a            D. the; 不填