题目

从方框中选择合适的词(组)，并用其适当形式填空, 完成下面的句子。 soon after, cut in, bump into, conversation, success 1. The party was very. Everyone had a good time. 2. Both of us enjoyed nice food and at the dinner. 3. The teacher was angry because Tom several times when she was speaking. 4. Jack was walking along the street in a hurry when he a boy. 5. we sat down, the play started.把一定量的Na2O2和NaHCO3的混合粉末分为两等份，将其中一份加入到100mL稀盐酸中恰好完全反应，生成的气体干燥后体积为2.24L（标况）；再将此气体通入另一份混合物中，恰好完全反应后，得到O2 2.016L（标况），则加入稀盐酸的物质的量浓度是A．3.4mol/L B．0.2mol/L C．1.8mol/L D．3.6mol/L