泄泻多发于季节（）
A.春、夏
B.夏、秋
C.冬、春
D.冬、夏
E.秋、冬
参考答案：B
Although ________ my opinion, the old professor didn't come up with his own. [ ]
A. in
B. on
C. for
D. against
防止析出性气孔的方法有哪些？
