题目

第二节 完型填空（共20小题；每小题1分，满分20分） 阅读下面短文，掌握其大意，然后从各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡将该项涂黑。 I was in a crowded local in Mumbai. I was lucky to find a seat as I had got in at the first station. Soon, the seats were all  21  ,and most people had to stand. In the middle of all this, I saw a girl about 10 years old. It was   22  that she was used to the crowd and the pushing, because she would silently change  23  to be just a little bit more comfortable. I fe楼道里，夜间只是偶尔有人经过，电灯总是亮着会浪费电能。科研人员利用光敏材料制成“光控开关”，天黑时自动闭合；天亮时自动断开。利用声敏材料制成“声控开关”，当有人走动发出声音时，自动闭合；无人走动时，自动断开。若将这两个开关配合使用（如图），就可以使楼道灯变得“智能化”，这种“智能”电路正确的是