【简答题】We did a lot of survey on the air pollution in the past.改为否定句 We ________ ________ a lot of survey on the air pollution in the past.
【单选题】Please put the letter ____________ the envelope. [ ]
【判断题】When writing a letter, the writer should put the letter date in the upper left corner of the letter body. ( )
【简答题】心脏表面,心房与心室分界标志是( ),左、右心室的分界标志是( )。
【单选题】下列选项中,不属于基本词的特点的是 ( )
【判断题】教师工作起来难度比较大,要想找出解决问题的最佳方案,只靠主观想象和猜测不可能取得良好的教学效果,必须借助于科学的方法。
【单选题】Put the letter ______ he can find easily.
【简答题】在心表面,____是心房和心室的分界标志;____是左、右心室的分界标志。
【单选题】After Mrs. Brown put the letter in the envelope, she sealed it and put a stamp on it.