在焦炉炭化室底部压力不变的情况下，集气管压力夏天比冬天（）。
A、增大
B、无变化
C、减小
D、都有可能
参考答案：C
减去-2m等于m2+3m+2多项式是______．
Miss Zhao is one of _____ in our school. [ ]
A. the popular teacher
B. the most popular teachers
C. popular teacher
D. more popular teacher
