组成星际有机分子的含量在前6名的化学元素中,哪种是在地球上的有机分子中排不进前6名的

题型:单项选择题

问题:

组成星际有机分子的含量在前6名的化学元素中,哪种是在地球上的有机分子中排不进前6名的?()

A、氢

B、氧

C、硫

D、硅

考点:天文学天文学题库
题型:单项选择题

阅读理解。

     A school party will be on Sunday Evening. The girls are talking about clothes.

     "I shall wear a black dress, so everybody will notice (注意) me," says Emily. "What about you,

Linda?"

     "I'm not sure. Maybe I'll wear jeans, an old skirt and a hat. People will notice me, too!" Linda

says.

      "What shall we do about the boys?" says Jane.

      "I hear that some of the boys learn to dance better this summer. Maybe it'll be better this time,"

says Mary.

      It is Sunday evening. Groups of students arrive. The music begins. The girls stand in a line on one

side, and the boys on another side. Mr. Green, their teacher, tries to get them together, but fails. After

a while Tim says, "I don't want to stand here the whole time. The party is only for two hours. It'll be

over soon." He starts to dance. All the others watches him. Then David asks Emily if she wants to

dance. Then Jack and Linda. Then, all begin to dance. Soon there are more dancers than watchers.

1. On Sunday evening, _________ will be held.

A. a birthday party                

B. a dance competition

C. a school party                  

D. a school meeting

2. The girls are talking about _________.

A. the party

B. their clothes for the party

C. the boys

D. how to dance in the party

3. When the music begins?

A. Tim says something.

B. Some students start to dance.

C. The girls stand in a line on one side and the boys on another side.

D. Groups of the students arrive.

4. What does Tim really mean?

A. Students should start to dance.

B. Students should stand the whole time.

C. The party would last two hours.

D. He will leave the party quickly.

5. _________ danced with Linda.  

A. Tim      

B. Jack    

C. David    

D. Emily

题型:单项选择题

下列方法中最能有效缓解我国人均资源不足的是[ ]

A、大力减少我国目前对自然资源的开发利用

B、科学合理地利用资源,保护资源,探索新资源

C、大力进口我国缺少的各种资源

D、合理利用非可再生资源

题型:单项选择题

有疟疾病史者接受治疗后无症状者应推迟献血()。

A.4年以上

B.6~12个月

C.3年以上

D.2~3年

E.5年以上

题型:单项选择题

YJ29滤嘴接装机的主要功能之一是:将双倍长度滤嘴段、烟支组合体切成两根等长滤嘴烟支后,进行分离、()、调头,最终将合格滤嘴烟支送至下游设备。

A、检测

B、漏气检测

C、空头检测

D、稀释度检测

题型:单项选择题

采用气体()对箱、罐等容器、设备找漏时,应使用压缩空气。

A.减压

B.正压

C.充压

D.降压

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