145.I looked under ____ bed and found ____ book I lost last week.

A.the;a

B.the;the

C./;the

D.the;/

146.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;/

145.答案是B，

两空均为特指。

146.答案是C，

sea ice为不可数；第二空泛指。