[单项选择]The most important ________of the farmers in Iraq is dates, of which Iraq is the world's leading exporter.
A. economic crop
B. cash crop
C. money crop
D. staple

[单项选择]The most important（）of the farmers in Iraq is dates, of which Iraq is the world's leading exporter.
A. economic crop
B. cash crop
C. money crop
D. staple

[单项选择]Norwegian farmers and fishermen have an important influence because ______.
A. they form such a large part of Norwegian ideal
B. their lives and values represent the Norwegian ideal
C. their work is so useful to the rest of Norwegian society
D. they regard oil as a threat to the Norwegian way of life

[单项选择]

One important aspect of retirement for most people is deciding where to live. In the past, this was not an issue because most elderly persons remained at home where they could be close to family. In contemporary times, parents and grown children go their separate ways, staying in touch through the telephone and, more recently, through e-mail. Every year, more than 400,000 adults who are 55 or older move out of their home state and relocate.
Florida leads all states in the proportion of elderly people-19 percent over 65 years of age, most of whom relocated from other places. Thus, Florida cities have become known as retirement centers. Among those prominently mentioned are Boca Raton, Daytona Beach, Fort Lauderdale, Fort Myers, Naples, and Ocala where between 20 and 25 percent of the residents is over 65 years of age. Two other Florida cities, Saint Petersburg and Sarasota, have even higher proportions-25 percent and 32 percent respectively. Other cities that have gained r
A. Retirement centers.
B. Retirement sites.
C. Retirement state.
D. Retirement communities.

[单项选择]The most important environmental influence on fish is water temperature, for fish tend to ______ the temperature of their surroundings.
A. avoid
B. exceed
C. assume
D. regulate

[单项选择]The author indicates that most important advances made by mankind dome from ______.
A. technical applications
B. apparently useless information
C. the natural sciences
D. the biological sciences

[单项选择]What is the most important religious denomination in Britain
A. The Catholic Church
B. The Methodist
C. The Anglican Church
D. The Presbyterian Church