题目

—What does your father often do after dinner?—He often ________ after supper. But now, he ________. A . reading newspapers; listening to music B . reads newspapers; listens to music C . reads newspapers; is listening to music D . is reading newspapers; listens to music 答案：C如图，C、D将线段AB分成2∶3∶4三部分，E、F、G分别是AC、CD、DB的中点，且EG=12cm，求AF的长。