地球岩石圈分为几个板块？
参考答案：
6个：欧亚板块、美洲板块、非洲板块、太平洋板块、印度洋板块、南极洲板块。
根据下面一段对话内容，从7个选项中选出能填入空白处的最佳选项，其中有两项为多余选项。
A:Yes,of course I do. ()
B:After the examination,please. First of all,why are you learning English
A:Why am I learning English
B:Yes,l mean,what are you going to do with it Are you going to be a teacher of English,or what else
A．You must have wronged me.
B．Oh! I’m so sorry about this.
C．Please stop just a second.
D．Are you Mr. Smith
E．But may I ask you something first
F．Is there anything I can do for you
G．Now, sit down please.
在做“验证力的平行四边形定则”实验中，小明画出了下图，其中合力的理论值是 （填F或F′）。若由于F1的误差使F1与F2的合力F方向略向左偏，引起这一结果的原因可能是F1的大小比真实值偏________（大或小）
