饲料级硫酸亚铁中硫酸亚铁含量测定的滴定终点是指（）不褪色为止。
参考答案：溶液呈粉红色30S内
—Do you know Li Ming?
—Li Ming? Which one? I know _______Li Ming in our class very well. He is _______Lei Feng of our times.
A．不填；不填
B．a;a
C．a;the
D．the;the
Life ____ be much happier if we ____ only be born at the age of 80 and gradually approach 18.
A．will, can
B．will, could
C．would, can
D．would, could
