采煤工作面一般应一次装药一次起爆，也可分组装药，但一组装药必须一次起爆，组与组之间的

填入下面文段空白处的词语，最恰当的一组是（）。

比尔﹒布莱森在他的《万物简史》里介绍了超级火山的巨大破坏性。以美国为例，①境内有一座超级火山喷发，②其产生的巨大能量将摧毁数千公里范围内的所有东西，无数人会因此丧命，③会导致整个国家被深达6~20米的火山覆盖，随后④会出现其他许多可怕后果，⑤目前人类还无法预测美国超级火山在何时喷发，⑥了解了它的杀伤力有利于我们制订各种减损预案。

A.A

B.B

C.C

D.D

When he was a boy, Tim was much influenced（影响） by the books about the sea, but in fact by the age of fifteen he had decided to become a doctor rather than a sailor. His father was a dentist and as a result, Tim had the opportunity of meeting many doctors either at home or elsewhere. When he was fourteen he was already hanging around the clinic (诊所) of a local doctor where he was supposed to help to wrap up medicine bottles, but was actually trying to listen to the conversations taking place between the doctor and his patients in the next room.

During the war Tim served in the Navy (海军) as a surgeon (外科医生). “That was the happiest time of my life. I was dealing with very real suffering and on the whole making a success of it.” In California he taught the country people simple facts about medicine. He saw himself as a life-saver. He had proved his skills to himself and his ability to take decisions. Thus, while he was able to tell them what to do, he could feel he was saving them. After the war, he got married and chose to be a doctor in the countryside, working under an old doctor who was popular in the area, but who hated the sight of blood and believed that the secret of medicine was faith. This gave the young man many opportunities to go on working as a life-saver.

小题1:Tim decided to be a doctor when he was________.

A．fourteen

B．fifteen

C．serving in the Navy

D．working in clinic小题2:Tim decided to become a doctor mainly because________

A．his father wanted him to be so.

B．his father was a surgeon.

C．he had read many books about medicine.

D．he had chances to know many doctors and know about what doctors did.小题3:Which of the following is not true?

A．during the war, Tim was a surgeon in the Navy.

B．he taught the country people simple facts about medicine in California.

C．after the war, he married the old doctors’ daughter.

D．Tim worked as a life-saver after war.小题4:From the passage we can infer(推出) that Tim_________.

A．was sent to Europe during the war.

B．was not afraid of blood.

C．decided to give up his doctor career.

D．regarded himself as a life-saver.小题5:The passage is mainly about­________

A．Tim’s life story

B．Tim’ dreams

C．Tim’s marriage

D．Tim’s patients

由于全球气温升高，珠峰冰川消融面积不断扩大．研究表明，大气中二氧化碳的含量增大是引起温室效应的主要原因．

（1）绿色植物通过______作用吸收CO₂，通过______作用将CO₂释放到大气中．

（2）科学家采取“组合转化”技术，将CO₂和H₂以一定比例混合，在一定条件下反应（反应的化学方程式如下），生成一种重要的化工原料和水．请在括号中填写该化工原料的化学式：2CO₂+6H₂=1（ C₂H₄）+4H₂O

（3）为了减缓大气中二氧化碳含量的增加，以下建议可行的是（填序号）______．

①开发太阳能、水能、风能、地热等新能源；②禁止使用煤、石油、天然气等矿物燃料；③大量植树造林、禁止乱砍乱伐．

（4）造成大气中二氧化碳的含量增大的主要原因是______．

（5）为了减缓温室效应，我们每个人都要从自己身边做起，比如说拒绝纸质贺卡，使用电子贺卡．拒绝纸质贺卡和减缓温室效应之间的关系是______．

（6）请你再举出一件你可做到的有利于减缓温室效应的事情______．

真核生物的mRNA叙述哪项正确？（）

A.分子上每三个核苷酸为一组决定肽链上的一个氨基酸

B.在胞质内合成和发挥其作用

C.代谢较慢

D.帽子结构是聚腺苷酸

E.是含有稀有碱基最多的

下丘脑-垂体-卵巢轴生理功能是

A．控制女性发育

B．控制正常的月经

C．控制性功能

D．参与机体物质代谢的调节

E．其神经内分泌受到大脑高级中枢调节