题目

There are(有)                 in a year and December is                  of the year.       A. twelve month; the twelfth month       B. the twelfth month; twelve months       C. twelve months; twelfth month       D. twelve months; the twelfth month 答案：D一块正方形玉米地，边长60米．如果每平方米地收玉米2千克，这块地收得多少千克玉米？