题目

一只气球以5m/s的速度匀速上升，达到离地面10m高度时，从气球上掉下一物体。不计空气阻力，则物体在第1秒内速度改变量的大小为m/s，物体落到地面所用的时间为s。（g取10m/s2） 答案：【1】10【2】2完形填空。“What is the most important part of your body?” My mother asked me a question one day. “Sound is very important to us, so it's my 1 , Mommy.” I answered.She said, “No. Many people 2 deaf(耳聋的), but they can live by themselves and even work. You can think 3 it and I will ask you again.”My grandfather died last year. When everyone was crying to 4 goodbye to him, my mom asked me the 5again.I didn't understand her, so I asked her, “It is a game 6 you and me?” She looked into my eyes and told me, “You know, it shows how you live 7 life.” She said with tears, “My dear, the most important body part is your shoulder(肩膀).”I asked, “Is it because it holds up my 8 ?”She replied, “No, it is because it 9 hold the head of a friend or loved one. 10needs a shoulder to cry on.”（1）A.body B.eyes C.ears D.head （2）A.are B.is C.isn't D.aren't （3）A.in B.at C.about D.with （4）A.tell B.say C.speak D.talk （5）A.answer B.experience C.problem D.question （6）A.from B.between C.for D.to （7）A.my B.his C.your D.her （8）A.head B.hand C.eye D.hair （9）A.can B.must C.have to D.has to （10）A.None B.Everybody C.No one D.Nobody