题目

俄罗斯在世界上占有重要地位的产业是（   ） A农业        B消费品生产       C纺织和食品      D核工业和宇航工业 答案：D—What did our science teacher say just now?—He asked us ___________ more attention ___________ the lab clean.A. to pay；to keep B. to pay；to keepingC. pay；to keeping D. pay；to keep