Space is a dangerous place, not only because of meteors（流星） but also because of rays from the sun and other stars. The atmosphere again acts  1  our protective blanket on  2 . Light gets through, and this is essential  3  plants to make the food which we  4 . Heat,  5 , makes our environments tolerable and some ultraviolet rays（紫外线的） penetrate（穿过） the 6 .Cosmic（宇宙的） rays of various kinds come  7  the air from outer space, but  8  quantities of radiation from the sun are screened off.  9  men leave the atmosphere they are  10 to this radiation;  11  their spacesuits or the walls of their spacecraft, if they are inside, 12 prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in  13 . Doses of radiation are measured in   14  called“rems （雷姆）”.We all  15  radiation here on earth from the sun, from cosmic rays and from radioactive minerals. The“ 16 ”dose of radiation that we receive each year is about two millirems; it  17  according to where you live, and this is a very rough estimate. Scientists have reason to think  18 a man can  19  far more radiation  20 without being damaged; the figure of 60 rems has been agreed.

1．A．for                       B．with                   C．on                      D．as

2．A．stars                    B．sun                    C．earth                  D．space

3．A．with                     B．from                  C．under                 D．for

4．A．use                      B．live                     C．eat                     D．get

5．A．again                    B．also                    C．besides               D．too

6．A．environment         B．space                 C．atmosphere         D．earth

7．A．across                  B．to                       C．from                  D．through

8．A．so                        B．enormous           C．various               D．proper

9．A．As soon as           B．As well as　　     C．As much as        D．As possible as

10．A．shown                B．exposed              C．faced                 D．covered

11．A．but                     B．because              C．so                      D．so that

12．A．get                     B．make                  C．have                   D．do

13．A．earth                  B．atmosphere         C．space                 D．environment

14．A．pieces                B．units                   C．parts                  D．elements

15．A．receive               B．accept                C．bring                  D．catch

16．A．unusual              B．common              C．general               D．normal

17．A．shifts                 B．converts             C．modifies             D．varies

18．A．what                  B．which                 C．that                    D．why

19．A．put up with         B．keep up with　    C．come up with      D．catch up with

20．A．from              B．than             C．as               D．away

Special Bridges Help Animals Cross the Road

―Reported by Sheila Carrick

Why did the chicken cross the road? To get to the other side.

Most people know this joke. But recently, some people have been much more worried about how the grizzly bear (灰熊) and mountain lion can cross the road.

“Millions of animals die each year on U.S. roads,” the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat, exist in the U.S. today. The main reason? Roadkill.

“Ecopassages (生态通道)” may help animals cross the road without being hit by cars. They are paths both over and under roads. “These ecopassages can be extremely useful, so that wildlife can avoid road accidents,” said Jodi Hilty of the Wildlife Protection Society.

But do animals actually use the ecopassages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an ecopassage that went under a highway. This showed that the lions used the passage.

Builders of ecopassages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders (火蜥蜴) and grizzly bears are using the bridges and underpasses.

The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass!

60. The writer uses the example of “ocelots” to show that _______.

A. wild animals have become more dangerous

B. the driving conditions have improved greatly

C. the measure for protecting wildlife fails to work

D. an increasing number of animals are killed in road accidents

61. From the news story, we know an ecopassage is ________.

A. an underground path for cars                       B. a fence built for the safety of the area

C. a bridge for animals to get over a river          D. a path for animals to cross the road

62. When the writer says that animals seem “to be catching on”, he means ________.

A. animals begin to realize the dangers on the road   

60. D 通过“ocelots”的例子来说明前面“Millions of animals die each year on U.S. roads,”这句话，

61. D。 “Ecopassages (生态通道)” may help animals cross the road without being hit by cars帮助动物穿过马路而不被车碰撞

62. B 从 Animals seem to be catching on. Animals as different as salamanders (火蜥蜴) and grizzly bears are using the bridges and underpasses.这句话可知动物在使用这些桥和路

63. D 让人们过马路时注意保护动物，不要碰撞到他们。

C. animals are crossing the road in groups               D. animals are increasing in number

63. The writer asks visitors and drivers to look around when traveling because ________.

A. wild animals may attack cars                       B. wild animals may block the road

C. they may see wild animals in the park           D. they may see wild animals on ecopassages