Malaysia Airlines (马航) flight MH370 disappeared from radar (雷达) screens an hour after it took off on March 8.It has 1 for more than 3 months.

    The plane may fall into the sea. China，Malaysia and many other countries have joined to search the 2 on the sea. The relatives of the 227 passengers and 12 crew (乘务人员) are 3 good news from them.

    How did the accident 4？It is said that the plane was attacked (攻击) by the terrorists. Some think there may be something wrong with the plane，and others think the accident may be 5 by the mistake of the crew. However it is 6 to tell the reason because the plane hasn't been found yet.

    It may 7 some time to find the missing plane and even more time to get to know the truth of what happened. However，we can't stop imagining what happened to the plane 8 it is found.

    Whether the missing plane is found 9 not，the whole world should pay more attention to the safety of people，especially at airports.

    We hope these people on the plane will be 10，and they can get together with their family members.

小芳同学把一根用砂纸打磨过的铁丝弯成螺旋状放入试管中，如图所示，放置一周后，装置中可能出现的现象是：①____；②____ ．分析产生上述现象的原因：____ ．日常生活中，铁生锈的现象很普遍，请举一例：____ ．写出一条防止该现象的措施：____ ．

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        陕西李广为上郡太守，尝从百骑出，卒遇匈奴数千骑。见广，以为诱骑，皆惊，上山陈。广之百骑皆大恐，欲驰还走。广曰：“吾去大军数十里，今如此以百骑走，匈奴追射我立尽。今我留，匈奴必以我为大军之诱，必不敢击我。”广令诸骑曰：“前！”未到匈奴阵二里所，止，令曰：“皆下马解鞍！”其骑曰：“虏多且近，即有急，奈何？”广曰：“彼虏以我为走；今皆解鞍以示不走，用坚其意。”于是胡骑遂不敢击。有白马将出，护其兵；李广上马，与十余骑奔，射杀白马将而复还，至其骑中解鞍，令士皆纵马卧。是时会暮，胡兵终怪之，不敢击。夜半时，胡兵亦以为汉军有伏军于旁，欲夜取之，胡皆引兵而去。平旦，李广归其大军。