A:0
B:1
C:9
D:无数
2+39=____
61+9=____
87+8=____
36+8=____
写出下列粒子的电子式:
(1)Na2O2 ____(2)氮原子 ____(3)Na2S ____(4)H2O ____
①楚人怜之(《陈涉世家》)____
②以光先帝遗德(《出师表》)____
③长跪而谢之(《唐雎不辱使命》)____
④欲信大义于天下(《隆中对》)____
⑤荆州北据汉、沔,利尽南海(《隆中对》)____
There ________ some tomatoes and milk in the box, but now there aren't any.