题目

反应3Fe（s）+4H2O（g）=Fe3O4（s）+4H2（g），在一可变的容积的密闭容器中进行，试回答： （1）增Fe的量，其正反应速率的变化是_______（填增大、不变、减小，以下相同）。 （2）将容器的体积缩小一半，其正反应速率__________，逆反应速率___________（填增大、减小、不变，以下相同）。 （3）保持体积不变，充入氦气使体系压强增大，其正反应速率___________，逆反应___________。 （4）保持压强不变，充入氦气使容器的体积增大，其正反应速率__________。阅读短文。根据短文内容给下面各题选择正确答案。Many boys and girls in western countries are wearing the same clothes. Many of them have long hair, so it is hard to tell whether they are boys or girls.One day an old man is sitting on a chair near a pool. A person is beside him. The old man asks the person, “Is it a boy or a girl in the pool?” The person answers, “A girl , she is my daughter.” “Oh, sorry,” the old man says, “I didn’t know you were her mother.” “You are wrong,” the person says, “I’m her father.”【1】What do many boys and girls in western countries wear?（ ）A. They wear red clothes.B. They wear colour clothes.C. They wear same clothes.D. They wear different clothes.【2】Is it easy to tell whether they are boys or girls?（ ）A. Yes, it is.B. No, it isn’t.C. Yes, it’s not hard.D. I don’t know.【3】Is it a girl or a boy in the pool?（ ）A. It’s a boy.B. It’s a girl.C. I don’t know.D. It’s a student.