红领巾小学三年级有男生257人，女生235人，已经体检身体的有387人，没有体检身体的还有____人。

①2NO(g) $\rightleftharpoons$ N₂O₂(g)△H₁平衡常数K₁

②N₂O₂(g)+O₂(g) $\rightleftharpoons$ 2NO₂(B)△H₂平衡常数K₂

下列说法不正确的是（   ）

将右栏中合适的答句的序号填在左栏前的横线上。

①Where's John?____                     A. It's in October.

②Where are the flowers?____               B. Yes, it was.

③When's your birthday?____              C. The students.

④What would you like as a birthday present?____ D. Yes, it is.

⑤Was it there a moment ago?____           E. I'd like a CD walk-man.

⑥Who are very happy today?____            F. She's ill at home.

⑦How is your mother?____                G. It's the 20th of May.

⑧Is it in your bag?____                    H. He's in the study.

⑨What are they?____                    I. They'rein the vase.

⑩What's the date today?____              J. They're nice pictures.