A：液体很难被压缩，说明分子间有引力
B：在做墨水滴入水中的扩散实验中，我们看不到墨水的分子在运动
C：有霾天气大量极细微的尘粒悬浮在空中，说明分子在做无规则运动
D：用手捏海绵，海绵的体积变小了，说明分子间有间隙
What you at the moment?
根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。
Xiao Lin has a good friend. Her 1 is Lucy. She is from the USA. She's a(n) 2. Xiao Lin and Lucy 3 in the same class. They go to school five days a4. They stay at 5 on Saturday and Sunday. Lucy 6 China and Chinese food. Her favorite 7 is rice cake. At school they play football after class. Xiao Lin and Lucy like 8 things. Now they are making a plane. They like flying planes on Saturday and Sunday. Lucy 9 English and a little Chinese. They are 10 friends.
（2015·湖南常德）2014 年 6 月 10 日上午 9 时许，湖北省潜江市浩口三小女教师秦开美面对持刀歹徒，临危不惧，把自己当人质，勇救本班学生，被大家称为“最美女教师”。秦老师的事迹说明（ ）
①无私奉献，是社会责任感的集中表现 ②每个人要弄清自己的角色，履行应尽的责任
③承担责任有时需要付出一定的代价 ④是否有回报应该成为我们履行责任的出发点
