如图所示，妈妈买了一辆电动车，回家后却发现一个难题：车库里只有一盏灯，但没有充电用的插座．爸爸打开灯的开关盒，看到里面有两个接线柱，于是他从这两个接线柱上引出两根导线，接上一个插座．接好后插上充电器，却发现电灯亮了，但亮度明显偏暗，造成这一现象的原因是由于连接错误而导致充电器与电灯 ________ 联；这时充电器 ________ （能/不能）正常充电，理由是__________．
串；不能；充电器两端电压低于额定电压（其他答案合理即可）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Test-taking tips Do you sweat, check your pencil, and feel butterflies in your stomach as your teacher hands out the test paper? A lot of people feel anxious when it is time to take a test. Here are some tips for taking tests: 1 .Your memory recall will be much better if you have had enough rest. In a scientific study, people who got enough sleep before taking a math test did better than those who stayed up all night studying. Read the test through first. Once you have the test paper in front of you, read over the entire test, checking out how long it is and all the parts that you are expected to complete. 2 .If something seems unclear before you start, do not panic: ask the teacher. Focus on addressing each question individually. 3 . Instead, answer the best way you can or skip over the question and come back to it after you have answered other questions. Relax. 4 .Of course you can not get up and move around in the middle of a test, but you can wiggle (扭动) your fingers and toes, take four or five deep breaths. As we all know, It can be easy to forget things we know well. During a test, if you forget something and start to get tense, it suddenly becomes much more difficult to remember. Finished already? Although most teachers will let you hand your test paper in early, it is usually a good idea to spend any extra time checking over your work. 5 .On the other hand, if you have 5 minutes until the bell rings and you are still writing, wind up whatever you are working on without panic.
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