双基限时练(六) module 2 section ⅱ 基 础 夯 实 ⅰ.单词拼写 1．after finishing writing the letter, he put it into the _________(信封)．答案 envelope 2．the average _________(产量) of the factory is 20 cars a day. 答案 output 3．he has the determination to _________(克服)all the difficulties.
