“机不可失，时不再来”指的是（）A．时间的相对性 B．时间的间断性 C．时间的顺序性 发布时间：2018-06-09 17:05 │ 来源：www.tikuol.com 题型：单项选择题 问题： “机不可失，时不再来”指的是（）A．时间的相对性B．时间的间断性C．时间的顺序性 D．时间的不可逆性
题型：单项选择题 Alice: Hi, Jerry, I heard you have fun with Peggy in Merry Park yesterday.Jerry: Yes. We had a great time there. Why didn’t you come with us? We got there by bus in only ten minutes.Alice: I know, but the ticket is more expensive on the weekend. Also, I’ve been there many times since it opened five years ago. Did you try the Dandelion Seat there? It’s so popular that people have to wait for over an hour to get a ride.Jerry: You mean those flower-like umbrellas that fly high in the sky?Alice: Yes. I enjoyed riding on the Dandelion Seat and looking over the city. It was a great experience.Jerry: Eh… I liked taking the train to get around the park better. I don’t think it’s fun to ride in the air. I’d feel like I could fall down any time.Alice: Maybe you would like it more at night. It’s wonderful to see the beautiful lights below your feet.Jerry: Well… I’m afraid of high places.Alice: Oh, I see. That’s too bad.小题1:What can we learn about Merry Park?A．It is newly opened.B．It is also open at night.C．It is across from Jerry’s house.D．It has the same ticket price every day.小题2: What may the Dandelion Seat look like?A．B．C．D．小题3:Which is NOT true?A．Alice went to Merry Park before.B．Jerry enjoyed going around Merry Park by train.C．Jerry would like to try the Dandelion Seat next time.D．Jerry and Peggy went to Merry Park on the weekend. 查看答案
题型：单项选择题 卫生球的主要成分是萘，其结构简式可表示为，则萘的分子式为________，若萘分子中有一个氢原子被氯原子取代，另有一个氢原子被溴原子取代，所形成的化合物种类有_________种；若萘分子中有2个氢原子被溴原子取代，所形成的化合物种类有_______种。 查看答案
，则萘的分子式为________，若萘分子中有一个氢原子被氯原子取代，另有一个氢原子被溴原子取代，所形成的化合物种类有_________种；若萘分子中有2个氢原子被溴原子取代，所形成的化合物种类有_______种。