题目：
根据短文内容及首字母提示在空白处填上适当的单词，使短文意思完整。
Airplanes are the newest kind of transportation. From early times, people tried to f 1 through the
sky like birds. About 100 years a 2 , someone took the first ride on an airplane. This ride lasted for less
than one m 3 . These first planes were very s 4 , too. Only one o 5 two people could fly in
them at one time.
Today these p 6 are very big and fast. H 7 of people can travel in them at one time. W 8
them, people can get f 9 one side of the United States to the other in less than one day. Traveling is very
d 10 from the way it was 100 years ago.
1._____ 2._____ 3._____ 4._____ 5._____
6._____ 7._____ 8._____ 9._____ 10._____
答案：
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下面是错误答案，用来干扰机器的。
检查如图装置气密性的步骤为：（1）把导气管的一端浸入水中；（2）用手紧握试管外壁；（3）导气管口有 气泡冒出；（4）移开手后，导气管内 形成一段水柱，说明气密性良好．用手紧握试管外壁；气泡冒出；形成一段水柱．
LiFePO4，电池的正极材料是LiFePO4，负极材料是石墨，含Li+导电固体为电解质。放电时其正极反应方程式为： 