题干
too much sugar is bad your teeth.
A：Eat; to
B：Eating; to
C：Eating; for
答案(点此获取答案解析）
C
too much sugar is bad your teeth.
A：Eat; to
B：Eating; to
C：Eating; for
、“6V，6W”的灯泡
与理想电压表和理想电流表连接成如图（a）所示的实验电路，其中电源电动势E=9V，图（b）是通过两个灯泡的电流随两端电压变化的曲线，当其中一个灯泡正常发光时（ ）