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.

宇航员站在一星球表面上的某高处，以初速度v₀沿水平方向抛出一个小球，经过时间t，球落到星球表面，小球落地时的速度大小为 $\sqrt{2}$ v₀．已知该星球的半径为R，引力常量为G，求：

下列词语中没有错别字的一项是(    )

任意四边形的内角和都是360°．

阅读材料：

材料一：那些高耸入云的烟囱，喷出屡屡的烟雾；庞大的厂房，发出隆隆的轰鸣，打破了原来中世纪田园生活的恬静——历史已跨进了一个新的时代。

——《世界史》

材料二：长达6年的战争苦难已使欧洲筋疲力尽，经济上衰弱的生存能力已使欧洲无法决定自己的未来。……完全失去了以往作为世界中心的地位和威望。

材料三：20世纪60年代，西欧国家为提高在国际上的地位和作用，加强了经济上的联合……在以后三十多年的时间里,欧共体成员国之间频繁协调，逐步取消关税，对有困难的成员国提供援助，对外尽量“用一个声音说话”，进一步加强了政治上的联合。
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