无意义密码子 A．AUG B．GUA C．UAA UGA UAG D．AUG UGA

读一读，判断正误。

( )1. The cat is in the box. 

( )2. The cat is under the table.  

( )3. The T-shirt is big.

( )4. The boy is short.

( )5. I have twenty books. 

如图所示，在等量正点电荷形成的电场中，它们连线的中垂线ab上有一电子，从静止开始由a点运动到b点的过程中（a、b相对O点对称），下列说法中正确的是（　　）

A．电子的电势能始终增加

B．电子的电势能始终减少

C．电子的电势能先减少后增加

D．电子的电势能先增加后减少

按要求写出下列名篇名句中的空缺部分。（两题任选一题）（5分）

（1）                                            ，天上人间。（李煜《浪淘沙》）

陶渊明的《归去来兮辞》和苏轼的《赤壁赋》中，面对自然生机，感叹人生短暂的句子是：

《归去来兮辞》：   

，                                           。

《赤壁赋》：  

，                                               。

（2）焉有仁人在位，                                            ？（《孟子•齐桓晋文之事》）

杜甫的《蜀相》和陆游的《书愤》中，诸葛亮竭忠尽智引起诗人无限慨叹的句子是：

《蜀相》： 

，                                            。

《书愤》：  

，                                            。 。       ，       。（杜甫《客至》）

2岁小儿，突发高热咳嗽，经治疗3天无效住院。入院次日突然烦躁，气促加剧，R66次/分，紫绀，心率170次/分，脉搏微弱，血压 9.3/6.7 kPa(70/50mmHg)，右肺叩诊鼓音，呼吸音消失，语颤消失，左肺有少量中小湿啰音，肝大右肋下3厘米。首要的措施是

A．紧急化验末梢血象
B．迅速应用快速洋地黄制剂
C．立即静滴苯甲异噁唑青霉素及卡那霉素
D．即行右侧胸膜腔穿刺
E．即作心电图检查

Although man has known asbestos for many hundreds of years, it was not until 160 years ago that it was mined for the first time on the North American continent. H. W. Johns, owner of a New York City Supply Shop for roofers, was responsible for the opening of that first mine.

Mr. Johns was given a piece of asbestos which had been found in Italy. He experimented with the material and then showed its surprising powers to his customers. After putting on a pair of asbestos gloves, which looked much like ordinary work gloves, he took red-hot coals from the fireplace and played with them in his hands. How astonished the customers were to discover that he was not burned at all. You can well imagine that he had increasing business in asbestos roofing materials. However, because it was very expensive to transport (carry) them from Italy to the United States, Mr. Johns sent out a young scientist to seek a source nearer home. This young man found great vein, in the province of Quebec in Canada.

Ever since 1881 Quebec has led the world in the production of this unusual mineral, which is made up of magnesium, silicon, iron, and oxygen. When it is mined, the asbestos is heavy, just as you would expect a mineral to be. When it is separated, a strange thing happens: the rock breaks down into fine, soft, soapy fibres.

Scientists do not know why the rock can be separated easily into threads, but they have found thousands of uses of this fireproof material, of the so-called "cloth of stone".

Which is the most important character of asbestos that the author wants to show us（）

A. It is like thread.

B. It feels soapy.

C. It burns easily.

D. It is unusually heavy.