15、____________that the trade between the two countries reached its highest point．

      A. During the 1990’s                                              B. That it was in the 1990’s

      C. It was in the 1990’s                                           D. It was the 1990’s

14、How does it ____________that he is so badly-off when he earns quite a good salary?

       A. come out                 B. come about               C. come up         D. come along

13、For Senior 3 students, choosing which college to attend ____________be the most exciting time in their entire school lives．    

   A. must                        B. should              C. would          D. can

12、Toys of the children today hardly bear any resemblance to ____________ of ____________ when we were little kids.

      A. that; ours                B. those; us             C. that; us          D. those; ours

11、____________ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.

     A. Freed                       B. Freeing                         C. To free                    D. Having freed

10、- It's nothing serious, doctor?      

- No, ____________.

      A. you’ll be all right soon                               B. you won’t be all right soon

      C. there’s some trouble with you                    D. it’s very serious

9、When we got to the scenic spot, they found everything ____________ while I felt ____________.

   A. interesting; differently                            B. interesting; different  

   C. interestingly; differently                         D. interestingly; different  　

7、Tourism, ______ it brings in money to a country, can also result in damage to the World Heritage sites there.

A. because                           B. as                            C. while                D. since

6、GENEVA, Feb.11 (Xinhua) ―The current La Nina weather phenomenon may just be a partial cause of south China’s freeze-up at the start of 2008, said the United Nations World Meteorological Organization (WMO) Monday.

The latest La Nina pattern, which began in the third quarter of 2007, has picked up strength in the past three months, with sea surface temperatures now about 1. 5 to 2 degrees Celsius（摄氏度）colder than average over large parts of the eastern and central equatorial Pacific Ocean, said the latest report issued by the WMO.

Presenting the Geneva-based body’s report, Rupa Kumar Killi, a WMO climate expert, said the recent month-long snow and ice-storms in China’s central, southern and eastern regions could be connected with the La Nina phenomenon, the climatic opposite of El Nino（厄尔尼诺现象）.

However, he said China’s freeze-up was a result of several causes combined and was partly caused by a cold surge from the north and west.

He also said the present La Nina cycle may last at least until mid-2008 and it is also possible, if less likely, that the cycle could stretch into the third quarter.

La Nina is a large pool of unusually cold water in the equatorial Pacific that develops every few years and influences global weather. It is the climatic opposite of El Nino, a warming of the Pacific, and both have been associated with extreme weather around the globe.

Since Jan. 10, snow, sleet and low temperatures have swept China’s southern regions, a rare occurrence for the area.

51. What partially caused south China’s freeze-up at the beginning of 2008?

A. La Nina.           B. El Nino.                 C. Typhoon.       D. Frost.

52.When did the latest La Nina weather phenomenon begin?

A. In the spring of 2007.                    B. In the summer of 2007.

C. In the fall of 2007.                        D. In the winter of 2007.

53. Which of the following statements is NOT true according to the passage?

A. Due to the La Nina, sea surface temperatures become colder over the eastern Pacific Ocean.

B. The La Nina phenomenon is the climatic opposite of El Nino.

C. There were several causes which brought about China’s freeze-up.

D. The present La Nina cycle may last until spring in 2008 and disappear.

54. What can we learn from the sixth paragraph?

A. La Nina does not happen every year but it influences global weather.

B. La Nina happens every year and influences global weather.

C. La Nina happens every year but seldom influences global weather.

D. La Nina happens every few years and brings about warm and wet weather.

55. What is the best title of the passage?

A. La Nina May Be a Partial Cause of China’s Freeze-Up.

B. La Nina and El Nino.

C. What Causes the La Nina Weather Phenomenon?

D. How La Nina Destroys the Whole World’s Weather?   

二、选择题

（每空？ 分，共？ 分）