①综合国力显著增强
②科技水平突飞猛进
③自主创新能力不断提升
④航天技术已遥遥领先于世界各国
A：①②③④
B：①②③
C：②③④
D：①③④
选出相对应的答句。
①What size do you want? ____ A. Yes, she does.
②Does Lulu like rabbits? ____ B. He's a farmer.
③What's your father do? ____ C. Size 25, please.
④Do you have any shoes? ____ D. Yes, I am.
⑤Are you a teacher? ____ E. Yes, we do.
读 《最苦与最乐》，文章最后所说的“卸却”责任与“解除”责任有何不同？
关于光纤通信，下列说法错误的是
