题目

把一只标有“12V  6W”字样的灯和一只电阻连到12V的电源上，灯能正常发光，而电路的总功率是9W，那么灯泡与电阻肯定是_____联的，且电阻的阻值为______Ω 答案：并联；48解析:略阅读下列短文，根据短文内容，从各题所给的四个选项中，选出最佳选项。 The school day begins at 8:45.Class teachers meet the class and check who is present and absent at the beginning of the day.We meet as a whole school once a week on Fridays.The head teacher speaks to the whole school.Morning lessons begin at 9:05.There are three one-hour lessons with a fifteen-minute break.The lunch break is from 1 pm to 1:45.Afternoon lessons begin at 1:50 and the school day finishes at 4 pm. All students study and take exams in maths,science and English. In addition, they choose one subject from history,geography,Art,Design and Technology,French and Spanish.. All students take PHSE(Personal Health and Safety Education)lessons but no exams are offered. After school sports practice and matches are arranged on Wednesday afternoon and Saturday morning.Chess,music,language and theatre clubs also arrange meetings after school.Students may join as many clubs as they like,but should join at least one. The school has a good record in sports. Last year we were champions（冠军）in football and tennis, and individual students won prizes for swimming and gymnastics. 1The first lesson begins at______ in the morning. A.7:30 B.8:00 C.8:45 D.9:05 2The school students ______once a week on Fridays. A.meet class teachers B.review their lessons C.listen to a speech D.take some exercise 3All students take an exam in ______. A.science B.history C.French D.PHSE 4What can we learn from the passage? A.School lunch break lasts over one hour. B.School football team wins matches every year. C.Students can join more than one club. D.Students do sports on Wednesday morning. 5What would be the best title for the passage? A.A busy school day B.Our colorful school life C.My favourite school D.My happy times at school