小明和小亮是同卵双生兄弟俩，但他们两人却一个较胖，一个很瘦，最可能的原因是[ ]

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。    

Chengdu has dozens of new millionaires, Asia’s biggest building, and fancy new hotels. But for tourists like me, pandas are its top（61）(attract).

So it was a great honour to be invited backstage at the not-for-profit Panda Base, where ticket money helps pay for research, I（62）（arrow）to get up close to these cute animals at the 600-acre centre. From tomorrow, I will be their UK ambassador. The title will be（63）(official) given to me at a ceremony in London.But my connection with pandas goes back （64）my days on a TV show in the mid-1980s,（65）I was the first Western TV reporter（66）(permit) to film a special unit caring for pandas rescued from starvation in the wild. My ambassadorial duties will include（67）(introduce) British visitors to the 120-plus pandas at Chengdu and others at a research in the misty mountains of Bifengxia.

On mu recent visit, I help a lively three-month-old twin that had been rejected by（68）(it) mother. The nursery team switches him every few（69）(day) with his sister so that while one is being bottle-fed,（70）other is with mum-she never suspects.

64（）

罚款、没收违法所得或者没收非法财物拍卖的款项，可以按比例分给作出行政处罚的行政机关作为执法经费。

A、B都是芳香族化合物，1molA水解得到1molB和1mol醋酸。A、B的分子量都不超过200，完全燃烧都只生成CO₂和H₂O。且B分子中碳和氢元素总的质量百分含量为65.2%(即质量分数为0.625)。A溶液具有酸性，不能使FeCl₃溶液显色。

A的分子式是______。

色谱-质谱联用仪进样系统中的接口应满足哪几个条件？