题目

如图，a、b是两个空间向量，则与是_________向量, 与是______向量. 答案：相等 相反阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式（不多于3个单词）。In the age of the smart phone, there seems no reason to ask questions about: the weather forecast, a business’s phone number or directions, ___【1】____ can all be easily found on Google, but very often people ___【2】____ (actual) ask these things by telephoning. Your answer may __【3】____ (reply) to with a thank-you e-mail.This isn’t the first time that great changes ___【4】____ (take) place in our manners due to technology. In ___【5】___ late 1870s, when the telephone was invented, people didn’t know how __【6】____ (greet) a caller. Often there is just silence. Alexander Graham Bell, the inventor, suggested that people say “Ahoy”, ___【7】___ finally “Hello” went out, the greeting is now used in everyday face-to-face communications.Try to be ___【8】____ (respect) no matter who you communicate __【9】___. Just keep it in mind that ___【10】___ (polite) never goes out of fashion.