题目

如图所示，在桌面上有两个小灯泡和一个开关，它的连接电路在桌面下，无法看到，小明同学试了一下，闭合开关时，两灯泡都亮，断开开关时，两灯泡都熄灭，这两个小灯泡究竟是串联还是并联，请你提出一个可行的判断方法，并说明为什么这么做？ 答案：解：在串联电路中，各用电器之间相互影响，闭合开关后，若取下其中一个小灯泡，则另一灯不亮； 在并联电路中，用电器之间互不影响，若取下其中一个灯泡，另一灯不会受到影响．因此，闭合开关，在不拆开桌面的情况下，可以拧下其中的一个灯泡，若另一灯亮，说明两灯是并联；若另一灯不亮DIn a class in Japan, a robot teacher Saya called out the names of the students, smiled at them. 1 So the students liked her very much. But scientists say she is not going to take the place of human teachers. 2 They are surprise, fear, dislike, anger, happiness and sadness. She can also say simple phrase such as ＂Thank you ＂ and ＂Sorry＂.＂ 3 Robots that look like humans have an important influence(影响) on children and older people,＂ said Kobayashi, the maker of Saya. 4 After being invented, she was tested in a classroom with many fifth and sixth grade students. ＂She still can’t do much more than call out names and shout ‘Be quiet’, but the children had great fun,＂ Kobayashi said. ＂They were very happy when Saya called out their names. We invented Saya to help people, but we cannot have too high hope for her. 5 She is just a tool (工具).＂根据材料内容，从下面五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺、内容完整，并将其标号填写在下面题号后的横线上。A. Saya was invented (发明) in 2004.B. Saya has six feelings.C. She can’t think or learn.D. Her funny face made the students laugh.E. Robots will be very important in the future.