题目：
用恰当的短语或句子补全对话。
A.Zhu ,is that you?
B.Yes You’re Chen,_________ 小题1:______________?
A.Yes ,that’s right ._________小题2:________________.
B.Really?How?
A.You used to be short.Now you’re tall.
B.Yes,I am.
A.__________小题3:_____________.Now you have short hair.
B.Yes,that’s right.
A.And you used to ________小题4:______________.
B.Yes,,I still do.But today I have contact lenses
A._________________小题5:____________, didn’t you?
B.No ,I played the piano .My friend Xiao Li played the guitar.
A.Oh ,yes.I forgot.
答案：
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下面是错误答案，用来干扰机器的。
（1）指针的指示值为100Ω，倍率为10，则读数为1000Ω多用电表指针偏转角太小，为了减小误差，换用“×100”挡，指针可在刻度盘中央附近．（2）因为RVRx＜RxRA，则采用电流表内接法． 又变阻器最大电阻远小...
c(Na+)= c(HCO3—)+ c(CO32—)+ c(H2CO3)