题目

During a recent holiday I visited Dusseldorf, a city in the former West Germany. The nine-day trip left a deep impression ___________ me. I arrived at Dussedorf airport at 7 pm. It was already  ___________ outside. The first thing I needed to do was to find a place to ___________ . I decided to telephone the youth hotel. But to use the phone I needed some ___________ , I asked a lady for help. To my ___________ she gave me three coins to use. But all the phones in the ___________ needed phone cards. And phone cards could only be bought at post offices during the ___________ . I was __在2L的密闭容器中，发生3A(g)＋B(g)  2C(g)的反应，若最初加入A和B都是4mol，10s后，测得υ(A)＝0.12mol/(L•s)，则此时容器中B的物质的量是 A.2.4mol          B.0.8mol          C.3.2mol          D.1.6mol