题目

．一列长为L的火车，匀加速通过一段长为2L的直的铁路桥，车头到桥头时的速度为v1，车头到桥尾时的速度为v2，则车尾到桥尾时的速度为（     ）A． B．        C．      D． 答案：A 根据句意，从方框内选择合适的单词，并用其适当形式填空。    e-mail,   who,   rubbish,   please,  normal 1.           flowers are these on the table?2. Mom is very           with her new job.3. You can use e-mail English when         your friends. 4. It         takes 20 minutes to get there.5. I forgot to take out the         when I left home this morning.