A、双氧水（H2O2） B、氧气（O2） C、氮气（N2） D、氢气（H2） E、稀有气体
阅读短文，判断句子正（正确）误（错误）。
Tom is my classmate. He is from London in England. But he likes China very much. Now he is in Beijing. He is a little fat. He has a round face and big blue eyes. His hair is not black but yellow. His nose, mouth and ears are big. He likes blue. He likes wearing a blue T-shirt and blue jeans. Look at his hand. He has a football in it. We often play football after class.
“此日漫挥天下泪，有公足壮海军威”。这副挽联悼念的民族英雄在黄海海战中英勇捐躯。他是（ ）
二次函数y＝ax2＋bx＋c的图象如图所示，则下列各式一定成立的是（ ）
