1) We must ___________ (限制) our spending.

2) I was very i___________ by one young man at my lectures; he’s a tall man with brown hair.

3) Jesus was the founder of the Christian ____________. (宗教)

4) The trees provide s__________ for the animals in the summer.

5) I don’t know much about the __________ (内容) of the letter.

6) If you b_________ from something, it helps you or improves your life.

7) As a child I was ____________(包围，环绕) by love and kindness.

8) The chair was i___________ for the kid, but a young man took it away.  

9）We’ll e__________ the business to make it bigger and includes more people, goods, or activities.

10) For further information, please _________(参考，参看) to Chapter Ten.

1) We must ___________ (限制) our spending.
2) I was very i___________ by one young man at my lectures; he’s a tall man with brown hair.
3) Jesus was the founder of the Christian ____________. (宗教)
4) The trees provide s__________ for the animals in the summer.
5) I don’t know much about the __________ (内容) of the letter.
6) If you b_________ from something, it helps you or improves your life.
7) As a child I was ____________(包围，环绕) by love and kindness.
8) The chair was i___________ for the kid, but a young man took it away.  
9）We’ll e__________ the business to make it bigger and includes more people, goods, or activities.
10) For further information, please _________(参考，参看) to Chapter Ten.

WASHINGTON—Two-thirds of the world’s polar bear population could be gone by 2050 if predictions of melting sea ice hold true, the US Geological Survey reported on Friday.
The fate of polar bears could be even worse than that estimate, because sea ice in the Arctic might be disappearing faster than the available computer models predict, the geological survey said in a report aimed at determining whether the big white bear should be listed as a threatened species.
“There is a definite link between changes in the sea ice and the welfare of polar bears,” said Steve Amstrup, who led the research team. He says Arctic sea ice is already at the lowest this year and is expected to retreat(退却) farther this month.
That means that polar bears—some 16,000 of them -- will disappear by 2050 from parts of the Arctic where sea ice is melting most rapidly, along the north coasts of Alaska and Russia, researchers said in a telephone briefing(简报).
Other polar bears could survive beyond that date but many of those could be gone by 2100, Amstrup said. By this century’s end, the only polar bears left might live in the Canadian Arctic islands and along the west coast of Greenland.
“It is likely to result in loss of approximately two-thirds of the world’s current polar bear population by the mid 21st century,” the report’s executive summary said.
“Because the observed trajectory(轨迹)of Arctic sea ice decline appears to be underestimated by currently available models, this assessment of future polar bear status may be conservative(保守的).”
In January, the US Fish and Wildlife Service proposed listing the polar bear as a threatened species, noting polar bears depend on sea ice as a platform to hunt seals, their main food.
Without enough sea ice, polar bears would be forced onto land, but they are poor hunters once they get out of the water and ice, the researchers said. The bears’ disappearance would probably take place as young cubs(幼兽)failed to survive to adulthood and females were unable to reproduce successfully.
【小题1】What was the US Geological Survey intended to do?