由于单圈弹簧管式压力表其弹簧管自由端的位移与（）之间具有正比关系，因此弹簧管压力表的

阅读理解。

     There was an old pear tree in a man's garden. In the past, the tree fruited

every year, so the man would get many pears. But now, the tree got old. There were no more pears for the man. So the ungrateful(忘恩负义的) man

decided to cut the tree down. When he walked to the tree with an axe(斧子)

in his hand, the tree said to him, "Please don't cut me down. I have brought so many pears for you in the past years. Now I only have a short time to live."

"I'm sorry. I have to do so," the man said, "because I need something to make a chair." Then he began to wave his axe. At that moment, a bird in the old tree said to him, "Don't cut it down! Every time you go out and your wife feels

lonely(寂寞的), she will come out to the garden and sit down under the tree

to enjoy its cool shade(树荫), and I sing songs to make her happy. We give

much pleasure(愉快) to your wife when you are away from home."

     The man didn't listen to the bird and drove(驱赶) it away. When he was

about to cut the tree, some bees flew out of it and said, "Listen! If you agree

not to kill this tree, we will give you delicious honey every day. Would you

please leave the tree with us?"

     The man got moved(感动). He said, "You are so kind to the tree, although it has become old. Now I see that I shouldn't cut it down. It has done so much to me and my wife. Let the tree stay here, and let the bird continue to sing

songs here." With these words, the man left. And the old tree lived there to its last day.

1. Which can be the best title of the story?

A. The Singing Bird

B. The Man's Wife

C. The Old Tree

D. The Kind Bees

2. Which is the most important reason(理由) for the man to cut down the

tree?

A. The tree was getting old.

B. The man needed wood to make a chair.

C. The tree didn't give any shade.

D. The man couldn't get any pears from it.

3. What made his wife happy when the man was not at home?

A. The tree and its shade.

B. The bees and their honey.

C. The bird and its songs.

D. The tree and the bird.

4. In the story, the word "continue" means "     ".

A. 再一次开始

B. 继续

C. 表演

D. 停止

5. What can we learn from the story?

A. People should never be ungrateful.

B. Good wood(木头) comes from pear trees.

C. Old people are kind and friendly.

D. Birds and bees are always helpful.

哪项不是舒张性心力衰竭的特点（）

A.心肌肥厚

B.左室射血分数减低

C.左室舒张期充盈降低

D.超声心动图E峰＜A峰

E.心腔大小正常

下列实验设计及操作，其现象足以说明结论的是[ ]

A．将浓盐酸和大理石反应放出的气体通入石灰水，始终未浑浊，则石灰水一定变质

B．取某氢氧化钠溶液放入试管中，滴加一定量的稀盐酸，没有气泡冒出，则氢氧化钠一定没有变质

C．向滴有酚酞的稀氢氧化钠溶液的试管中滴加稀盐酸，红色褪去，则说明二者发生反应

D．将充满二氧化碳气体的试管倒扣在盛有氢氧化钠溶液的水槽中，试管内液面上升，则说明二氧化碳与氢氧化钠一定发生了反应

关于原发性三叉神经痛描述，不正确的有（）

A.呈周期性发作，缓解期可达几年，在此期间，疼痛缓解甚至消失，故可认为本病有自愈性

B.绝不会出现局部感觉减退

C.春季及冬季容易发作

D.随着疾病发展，发作愈来愈频繁，间歇期亦缩短

E.仅有一个“扳机点”

石脑油是（）的原料，也是生产（）的原料。