任务型阅读

    Have you taken a plane? Have you thought about the ways to survive(生存) in a plane crash(坠机)? Here are some tips for you. ____.

    ____ .The key to survive on planes is how quickly you can get out. So it's best to get seats as close as possible to a door. Or try to sit in the back of the plane because passengers in the back seats are safer than those in the front.

    ____ .First of all, read the safety information card and listen to the safety speech carefully. Every type of plane has different safety instructions. If you're sitting near a door, make sure you know how to open it if you need to. What's more, don't forget to keep your seat belt fastened(系牢) .

    ____.When there is a fire, breathing smoke in is one of the main causes of death. So cover your nose and mouth with a cloth to avoid it.

    ____.Don't be too nervous and try to keep a cool head all the time. Remember that even in the worst situation, you still have a chance to be safe.

我国通过建立以法律为核心，以立法保障和司法保障为主要内容的权利保障体制，保障公民的权利。（    ）

如图所示的电路中，开关S闭合时，灯L₁和L₂是  ____联的，若电源电压为8V，电压表的示数为3V，则灯L₁两端的电压是　  ____V，灯L₂两端的电压　 ____V．