下列各句标点符号使用正确的一项是( )
A:小生这一去,白夺一个状元,正是“青霄有路终须到,金榜无名誓不归。”
B:英国女作家罗琳所写的长篇系列小说:《哈里·波特与密室》和《哈里·波特与魔法石》,在世界上引起了轰动,创造了出版史上的神话。
C:暖溶溶的玉醅,白泠泠似水,多半是相思泪。眼面前茶饭怕不待要吃,恨塞满愁肠胃。“蜗角虚名,蝇头微利”,拆鸳鸯在两下里。
D:是什么打动了晋武帝?是李密对祖母的至孝的真情?是祖孙二人相依为命的困难处境?还是对晋武帝的“生当陨首,死当结草”的效忠保证?
⑴—____
—Sam. And he is heavier, too.
⑵—Did you go hiking yesterday?
—No, ____
—Oh, I'm sorry to hear that.
⑶—Hey, Linda.____
—Oh, I read it the day before yesterday.
⑷—____
—Yes, of course. I want to see it again.
⑸—____
—I stayed at home and drank tea.
A. Let's read the film magazine together.
B. Who is taller?
C. What did you do yesterday?
D. I had a cold and slept.
E. Was the film interesting?
“神舟五号”的成功发射与回收,表明我国的载人航天技术已经进入世界领先水平。在飞船的火箭推进器中常装有液态肼(用X表示)和过氧化氢(H2O2),它们混合时的反应方程式为:2H2O2+X=N2↑+4H2O,则肼(X)的化学式为( )