After ten years of being a housewife and a mother,Carol could not stand it any longer.Then,one?morning,just after her two daughters had gone to school,she saw an advertisement（广告）in the pa-per.She phoned,and was asked to come to an interview（面谈）that very afternoon.
Mr.Hollins,who interviewed her,was a young man about 24 in a blue suit.There was a hard?look in his eye and he talked very fast.He told her she would be required to stop men between the?ages of 21 and 50 and ask them several questions designed to determine what men think of deodor-ants（除臭剂）.The information was to be recorded and she would be paid according to the number?of complete interviews she had.
When Carol asked which factory the research was for,she was told that was not important.Last?of all,before she began she would have to attend a one-day training.Carol accepted.After the train-ing,which was only about how to write down the answers correctly in a form and how to put the ques-tions,Carol found herself in the center of town at 9:30 in the morning.She soon found out that get-ting the information was really not all that easy.
First,she stopped a man who refused to answer any questions because he had no time.Next,a?man told her it was none of her business whether he used deodorants or not.Then she interviewed a?man who was hard of hearing and,instead of answering her questions,began asking her all sorts of?his own.Finally,Carol found a young man with a pleasant smile on his face.He was coming towards?her slowly and seemed ready to talk.He looked surprised when she put her first question."I′m doing?a research,too.It′s about soap powders,"he said.
Mr.Hollins told Carol that she was required__________.
第二段第三句说明给Carol面试的Hollins先生要求她去采访一些男人并收集对此除臭剂的意见。可确定B项正确。
把10gMgCl2和MgSO4的混合物溶于适量水中，滴加2mol／L的BaCl2溶液至沉淀完全，共消耗BaCl2溶液25mL。求混合物中MgCl2和MgSO4的质量各是多少克
固定在匀强磁场中的正方形导线框abcd，各边长为1．其中ab是一段电阻为R的均匀电阻丝，其余3边均为电阻可忽略的铜线。磁场的磁感应强度为B，方向垂直纸面向里。现有一与ab段的材料、粗细、长度都相同的电阻丝PQ架在导体框上，如图所示。PQ以恒定速度方向如何
一小物块以速度v0=10m／s沿光滑地面滑行，然后沿光滑曲面上升到顶部水平的高台上，并由高台上飞出，如图所示。问当高台的高度h多大时，小物块飞行的水平距离最大这个距离是多少(g=10m／s2)
某晶体盐的水溶液呈浅绿色，在此溶液中通入氯气，溶液变为棕黄色，把所得棕黄色溶液分成两份：一份加入KSCN溶液，溶液变深红色；另一份加入BaCl2溶液，产生不溶于稀HNO3的白色沉淀，则该晶体盐的化学式是_______。
欲除去乙烷中的乙烯，可将混合气体通过盛有_______的洗气瓶；欲除去乙炔中的硫化氢，可将混合气体通过盛有_______的洗气瓶。
浓硝酸常盛装在棕色瓶中，且贮放在冷暗处，原因是_______，
碳酸氢钠溶液和烧碱溶液反应的离子方程式为_______。
常温下，氨水中存在的离子有_______。
在酸或碱存在的条件下，甲酸甲酯跟水发生水解反应的化学方程式为_______。
有下列几种气体：H2、O2、HCl、NO、NH3、CH4，其中通常情况下能用来和水做“喷泉”实验的是_______。
