冠心病病人行非心血管手术时，可增加围术期急性心肌缺血发作的危险因素，主要有（）。 A

（10广东省20）根据表格回答：部分酸、碱和盐在水中的溶解性（20℃）

	OH-	NO3-	Cl-	SO42-	CO32-
H+		溶、挥	溶、挥	溶	溶、挥
Na+	溶	溶	溶	溶	溶
Ca2+	微溶	溶	溶	微溶	不溶
Ba2+	溶	溶	溶	不溶	不溶
Cu2+	不溶	溶	溶	溶	不溶
Zn2+	不溶	溶	溶	溶	不溶
Fe3+	不溶	溶	溶	溶	不溶

（1）Ba（OH）₂的溶解性为     ，从上表中找出一种微溶性盐        （填化学式）。

（2）Zn（NO₃）₂、CuCl₂两种溶液      发生反应（填“能”或“不能”），理由是          。

（3）现有一包白色固体混合物,可能由BaCl₂、KNO₃、CuSO₄、FeCl₃、Na₂CO₃、Na₂SO₄、NaCl等中的几种混合而成，为证明其组成，做如下实验：

步骤一：取一定量该固体混合物加入足量的水，充分搅拌，得到白色沉淀和无色溶液。过滤得到白色沉淀A，无色滤液B。

步骤二：向白色沉淀A中加入过量的盐酸溶液，沉淀部分溶解。

步骤三：向无色滤液B中加入硝酸银溶液，产生不溶于稀硝酸的白色沉淀；则该固体混合物中一定含有，可能含有           ；

步骤二中可能发生反应的化学方程式为        。

It had been a long，hard，wonderful day.The two of us had walked from the sea’s edge through the length of a beautiful valley，climbed a superb mountain，travelled its narrow，rocky ridge(山脊)，and now stood on its final peak，tired，happy and looking for the perfect campsite.

The experienced backpacker has a natural feeling for such things，and our eyes were drawn to a small blue circle on the map，like an eye winking at us.We could not see it from where we were，but we followed our judgement and went down steeply until it came into view.

We were right.It was a calm pool，with flat grass beside it.Gently taking our packs off，we made the first of many cups of tea before pulling up our tent.Later that evening，over another cup of tea and after a good meal，we sat outside the tent watching the sunset over a sea dotted with islands，towards one of which a ferry was slowly moving.It is not always so perfect，of course.On another trip，with a different companion，a thoroughly wet day had ended at a lonely farm.Depressed at the thought of camping，we had knocked and asked if we could use a barn(谷仓) as a shelter.

Backpacking could be defined as the art of comfortable，self­sufficient(自给自足的) travel on foot.Everything you need is in the pack on your back，and you become emotionally_as_well_as_physically_attached_to_it.I once left my pack hidden in some rocks while I made a long trip to a peak I particularly wanted to climb.I was away for nearly three hours and ended up running the last stretch in fear that my precious pack would not be there.It was，of course.

The speed at which the backpacker travels makes this the perfect way to see any country.You experience the landscape as a slow unfolding scene，almost in the way it was made；and you find time to stop and talk to people you meet.I’ve learned much local history from simply chatting to people I met while walking through an area.At the end of a trip，whether three days or three weeks，there’s a feeling of achievement，of having got somewhere under your own power.

After years of going out walking just for the day，many people start backpacking simply through wanting to stay out rather than cut short a trip.

小题1:The writer and his companion knew there was a pool because ________.

A．they had been told about it

B．they could see it on the map

C．they had seen it earlier in the day

D．they could see it from the top of the mountain小题2:What does the underlined word “it” in Paragraph 2 refer to?

A．The map.

B．The pool.

C．The mountain.

D．The campsite.小题3:How did the writer and his companion feel at the end of the day?

A．They were too tired to put up their tent.

B．They wished they could have found a farm.

C．They were anxious about the coming weather.

D．They were delighted with the spot they’d found.小题4:What does the writer mean by being “emotionally as well as physically attached to it ” in Paragraph 4?

A．It is more than just a practical aid.

B．He walks better when he is wearing it.

C．It is not a good idea to leave it anywhere.

D．He might die on the mountains without it.

阅读理解。

     Every day life is made and lost. Every day, life goes on. Every day we experience some of the most

important parts of life and may not even realize it: love, generosity, and perseverance. These values aren't

just important to us; they make the world what it is.

     Scientists say that gravitational (重力的) force makes the world turn, but some people say that love

makes it go round. Love can be found anywhere: in families, friends, and even complete strangers. Even

if you can't see it, you know it's there.

     Love may connect people all over the world, but what would the world be without generosity? Whether

after a national disaster, or a school fund-raiser, one thing is certain-it is better to give than to receive.

Generosity is found everywhere and whether it's a large or small act, it makes a difference. Most of all,

being generous is not something you need any qualifications for, but no matter what you do, it can make

a difference. Sometimes, though, it takes effort to be generous, which leads us to perseverance.

     Founding a country, riding a bike, or finishing an essay, these are all finished with perseverance.

Perseverance is the one thing that can help us achieve whatever we want. It is what helps scientists to

discover cures for diseases, and athletes to become champions. You may fail, but every time you make

a mistake, that's one less to make the next time.

     There is an infinite (无穷的) number of things we value, but without love, generosity and perseverance,

we just don't think that our life or the world would be the way it is.

1. The underlined word "it" in the second paragraph refers to "_____". [ ]

A. the world

B. gravitational force

C. value

D. experience

2. To be generous, the author thinks _____.[ ]

A. you needn't make efforts

B. you should be qualified

C. you should give all you have

D. you will find it good to give

3. Which of the following statements is TRUE according to the passage? [ ]

A. Perseverance is the only thing that can help us to achieve success.

B. People don't understand the life they are experiencing at all.

C. We can find love in complete strangers sometimes.

D. What the world is like depends on gravity and love.

4. What would be the best title for the passage? [ ]

A. Success and Failure

B. Three Values

C. Endless Love

D. Life Full of Hope

5. We find the passage conveys a(n) _____ attitude to us when we read between the lines. [ ]

A. negative

B. positive

C. indifferent (漠不关心的)

D. worried

除了下列哪一种化合物外，其它什么物质分子中都含有高能磷酸键（）。

A.磷酸烯醇式丙酮酸

B.磷酸肌酸

C.ADP

D.葡萄糖-6-磷酸

E.1，3-二磷酸甘油酸

成本预测及混合成本分解中的高低点法中的低点是指（）。

A.单位成本最小的点

B.业务量最小的点

C.成本总额最小的点

D.成本与业务量均最小的点