心室肌细胞动作电位持续时间较长的主要原因是（） A.动作电位0期去极化的速度慢 B.

高渗性脱水补充累积损失量，应补

A．生理盐水

B．平衡液

C．2：1溶液

D．5%葡萄糖盐水

E．5%葡萄糖

思想解放对人类社会发展起着推动作用。结合所学知识，回答下列问题：

（1）14世纪由意大利开始的思想解放运动的名称是什么？它提倡以人为中心，对当时社会产生了怎样的影响？（4分）

（2）18世纪法国启蒙思想家孟德斯鸠在《论法的精神》一书中，阐述了怎样的学说观点？这一学说观点对一些国家的政治制度产生了影响。请你列举一个国家说明。（2分）

（3）中国前期的新文化运动对当时社会起了怎样的积极作用？请你列举两位代表人物。（4分）

人类使用的冷媒氟氯碳化合物进人大气中分解成氯原子，它会与臭氧反应产生氧化氯，而两个氧化氯结合后生成过氧化氯。研究再次证实，由冰箱与冷气机所排放的氟氯碳化合物为臭氧层破坏的主因，而且过氧化氯分子破坏臭氧的效率较以往认知的更快，以明确证据平息了两年来学术界对于臭氧层被破坏方式的重大争议。这段话主要说明( )。

A．臭氧层破坏与人类活动的关系再次研究证实

B．臭氧层破坏的方式学术界不再存在重大争议

C．过氧化氯分子破坏臭氧的效率得到认知

D．过氧化氯分子破坏臭氧的效率比已知的更快

阅读理解。

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Question: I have been learning English for about 7 years.   1   And I still can't make myself understood in

English. However, I love learning English. How can I learn English well? Please help me.

     Answer: Many people have asked me this question.   2   Here I will give you several tips for learning English.

   3   

     First of all, you must want to learn. If you are not interested in learning English, no class will help you and

no book will help you. So you have to be honest with yourself. Ask yourself, "Do I really want to learn

English?" If you can't answer "yes" to this question, it is better for you to set English aside until you're ready

and willing to learn.

     Set goals(目标)

     To learn English well, you must set some goals.   4   It will also help you to see your progress. Ask

yourself,"What are my goals? What areas would I like to improve?" Think about what your goals are, and

review once in a while to see that you are making progress toward your goals.

      Practice, practice, and practice.

     After you have set your goals, you have a better idea of what you need to practice. Just like the athlete

whose goal is the Olympics must train daily, you as a language leaner must practise language every day to

make progress toward your goal.   5   

A. Want to learn.

B. I think it is not easy to learn it well.

C. Make friends with some Americans online.

D. Reading is a very good way to learn new words.

E. The answers are as different as the people asking the question.

F. The more you practise, the more progress you will make.

G. Having goals will help you remember what areas you want to work on.

下列关于桥梁受力特性的说法正确的是（）

A、简支梁桥在日照温差作用下将产生附加内力。

B、斜拉桥主梁属于压弯结构。

C、考虑连拱作用对拱圈是偏于危险的