A：①②③④
B：①②③
C：②④
D：②③④
用野生梨树做砧木，用具有优良性状的梨树芽做接穗进行嫁接．下列有关叙述那项不正确？（ ）
怎样才能把一行树苗栽直？请你想出办法，并说明其中的道理．
Mr. Thomas is the ______________ of our teachers.
My name is Sally. I am a school girl. My school is far from my home. So I can't go to school by bike. I often go there by bus. I must get up very early every morning. I have no time for breakfast at home. I often eat something for breakfast on the way(在路上). I want to go to school on time(按时).
