A：7＝9：B，那么AB＝____。
Last year was the warmest year on record, with global temperature 0.68 ℃ ____ the average.
下列有关碳和碳的氧化物的说法中，错误的是（ ）
读一读，选择正确的答案，将字母代号写入前面的括号内。
①Is he young?____ A. She's my sister.
②Is that a boy? ____ B. No, she's a girl.
③Who's she? ____ C. Yes, he is.
