要测量某电阻的阻值，实验桌上有下列器材：电流表A（0﹣0.6A），电压表V（0﹣3V），电源4.5V，滑动变阻器R，开关，导线，待测电阻R_x（约6Ω左右）．实验要求：多测几组数据且两电表都不能超过其量程．

1825 年 9 月，史蒂芬孙设计制造的火车机车（如图）正式试车。为该车提供动力的是（   ）

—No wonder the emperors all wear clothes with dragons.

根据短文内容从下面方框的7个选项中选出5个还原到文中，使短文意思通顺，结构完整，并将其答案的序号填到相应位置。
Dear Zhang Wei,
   I'm in New York now.____ . My English teacher is good-looking. Everyone in our class likes her very much.
____ . They are Sara, Ben, Nick and Peter. Sara has long straight hair.____ Ben has short curly hair and he can speak French very well, because his mother is a Frenchwoman. Nick and Peter are twins (双胞胎). ____. They can sing well.
What about your school life?____ .
                                                                                                                                                             Yours,
                                                                                                                                                             He Bin