下列划线字音完全正确的一项是（　　　）

①H₂SO₄（aq）+2NaOH（aq）=Na₂SO₄（aq）+2H₂O（l）

②H₂SO₄（aq）+Ba（OH）₂（aq）=BaSO₄（aq）+2H₂O（l）

③NH₃•H₂O（aq）+HCl=NH₄Cl（aq）+H₂O（l）

④NH₃•H₂O（aq）+CH₃COOH（aq）=CH₃COONH₄（aq）+H₂O（l）

其中反应热为57.3kJ/mol的是（   ）

Samuel said____ he used to____ some ice﹣cream for a snack．

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.