阅读理解     

 My name is Dora.I’m American and I’m thirteen.I’m a student in No.7 Middle School.I like music very much.I can play two instruments— the guitar and the piano.I play them very well and I’m on the school art club.

Jeff and Michael are my brothers.They are students,too .But we aren’t in the same school.They like sports.Jeff plays basketball and soccer           very well.Michael swims and plays ping-pong very  well.I am not good at sports.They help me with sports after school.

We live in London with our parents now.My mother is an English teacher and my father is a musician.My mother swims well.My father can play the violin.

甲：⑴取AB中点D

    ⑵过D作直线AC的平行线，交 $\widehat{BC}$ 于P，则P即为所求

乙：⑴取AC中点E

    ⑵过E作直线AB的平行线，交 $\widehat{BC}$ 于P，则P即为所求

对于甲、乙两人的作法，下列判断何者正确？（   ）

已知甲、乙、丙是中学常见的三种气体单质，相互间反应可制得化肥B．其转化关系如图1所示：