20÷5＝4，用到的口诀是（ ）
A：二五一十
B：四五二十
C：四五得九
(____)1.A.pen B. pencil C. to
(____)2.A. run B. in C. walk
(____)3.A.ruler B. crayon C. flower
(____)4.A.easy B. this C. that
(____)5.A.here B. there C. book
—I was in the library.
如图1，AB∥CD，EOF是直线AB、CD间的一条折线．
— How do you spell it ?
— .
