【简答题】Fill in the blanks with the appropriate sentence. You just write the letter indicating the sentence into the blank(根据对话上下文的意思,选择正确的句子,并将句子序号填入空格内). A) Or maybe investing in something interesting. B) ...
【单选题】With the help of the teachers and classmates, the boy worked hard and finally caught up with his classmates. Now he is _______ all the others.
【单选题】1加入惰性气体,对火焰传播速度的影响是( )。
【单选题】下列文件的扩展名中,一般用于表示视频文件的是()