FoxBASE某些类型的文件只有在库文件打开的情况下才能打开,在库文件关闭时自动关闭。属于这一类文件的扩展名的有______:

A. one hundred miles

B. three hundred miles

C. one hundred and fifty miles

D. six hundred miles

A. flowers and vegetables from Devon are on the market one month earlier

B. farmers in the southwest grow as many vegetables and flowers as farmers elsewhere

C. people in the southwest have to pay a higher price for vegetables and flowers

D. vegetables in Cornwall ripen as much as a month earlier than flowers . .

A. it is cold and wet all the year round

B. the climate is pleasant as a whole

C. it is warm most of the time in a year

D. only the summer is not cold. or wet

A. much less

B. some more

C. far less

D. far more

A. put up with

B. fall in with

C. do away with

D. get along with

A. faded

B. torn

C. dirty

D. crushed

A. beautiful

B. natural

C. artificial

D. similar

A. element

B. spot

C. sense

D. point