10.A.greedily B.easily

C.hardly D.quickly

11.A.Generally B.Even

C.So D.But

12.A.sought B.lasted

C.continued D.began

13.A.enlarge B.shorten

C.tighten D.darken

14.A.In conclusion B.In time

C.In fact D.In particular

15.A.walk B.fly

C.flee D.run

16.A.wing B.tale

C.subject D.cocoon

17.A.get out B.get through

C.get away D.get down

18.A.freedom B.outcome

C.balance D.reliability

19.A.struggles B.passions

C.manners D.spirits

20.A.weak B.intelligent

C.gifted D.strong

Ⅱ.阅读理解

　　In recent years，much of the sea ice that polar bears use as a hunting platform for seal meals has melted，forcing some bears-particularly young males-farther north or onto land，where they are not as skilled at hunting.When stuck on land for months，a polar bear typically is forced to survive on its own fat reserves.

　　The bears were listed earlier this year as a threatened species under the U.S.Endangered Species Act as populations have declined.Meanwhile，snow geese are booming near the western Hudson Bay，and there are in fact too many of them.Their eggs can be a good food source.The geese nest on tundra(冻原，苔原) that some bears have retreated to.

　　"Over 40 years，six subadult(接近成年的) male bears were seen among snow goose nests，and four of them were sighted after the year 2000，" says Robert Rockwell."I've seen a subadult male eat goose eggs whole or press its nose against the shell，break it，and eat the contents."

Ice is melting，on average,0.72 days earlier each year in the region studied.Snow geese are hatching eggs about 0.16 days sooner each year，according to Rockwell and his graduate student