在已探明的气田上，为了开采天然气而钻的井称为（）。
A.钻井
B.资料井
C.探井
D.生产井
参考答案：D
Look at the picture and complete the words. 看图，补全单词。
c w e m o
This is my _____. The oranges in it are green.[ ]
A. question
B. friend
C. picture
D. pen
