GIST可发生在消化道的任何部位，从食管中段至肛门。GIST的最好发部位是（） A.

（8分）实验室制取乙烯，常因温度过高而发生副反应。部分乙醇跟浓硫酸反应，生成炭黑、二氧化硫、二氧化碳和水蒸气。请用下图编号为①~⑥的实验装置，设计一个实验，以验证上述反应后的混合气体中含有二氧化硫、二氧化碳和水蒸气。

（1）装置⑤中的固体药品为                         ，用以验证的产物是                       。

（2）装置④中的溶液是                                ，用以验证的产物是                       。

（3）装置①中的现象是                         ；装置②中溴水的作用是                        。

（4）实验室制备乙烯的化学方程式：                                        。

I missed the last bus, so I _____ go home on foot.

A．must

B．have to

C．may

D．had to

下列哪种药物不是杀菌药物

A．链霉素

B．吡嗪酰胺

C．乙胺丁醇

D．异烟肼

E．利福平

Directions: Read the following passage carefully and then translate each underlined part into Chinese.
21. We might be inclined to attribute to the act of thinking complete from language if the individual formed or were able to form his concepts without the verbal guidance of his environment. Yet most likely the mental shape of an individual, growing up under such conditions, would be very poor. Thus we may conclude that the mental development of the individual and his way of forming concepts depend to a high degree upon language. This makes us realize to what extent the same language means the same mentality. In this sense thinking and language are linked together.
What distinguishes the language of science from languages, as we ordinarily understand the word How is it that scientific language is international What science strives for is an utmost acuteness and clarity of concepts as regards their mutual relation and their correspondence to sensory data. As an illustration, let us take the language of Euclidean geometry and algebra. They manipulate with a small number of independently introduced concepts, respectively symbols, such as the integral number, the straight line, the point, as well as with signs which designate the fundamental concepts. This is the basis for the construction, respectively definition of all other statements and concepts. The connection between concepts and statements on the one hand and the sensory data on the other hand is established through acts of counting and measuring whose performance is sufficiently well determined.
22. The super-national character of scientific concepts and scientific language is due to the fact that they have been set up by the best brains of all countries and all times. In solitude and yet in cooperative effort as regards the final effect they created the spiritual tools for the technical revolutions which have transformed the life of mankind in the last centuries. Their system of concepts has served as a guide in the bewildering chaos of perceptions so that we learned to grasp general truths from particular observations.
23. What hopes and fears does the scientific method imply for mankind I do not think that this is the right way to put the question. Whatever this tool in the hand of man will produce depends entirely on the nature of the goals alive in this mankind. Once these goals exist, the scientific method furnishes means to realize them. Yet it cannot furnish the very goals. The scientific method itself would not have led anywhere. It would not even have been born without a passionate striving for clear understanding.
24. Perfection of means and confusion of goals seem--in my opinion--to characterize our age. If we desire sincerely and passionately the safety, the welfare and the free development of the talents of all men, we shall not be in want of the means to approach such a state. Even if only a small part of mankind strives for such goals, their superiority will prove itself in the long run.

关于SC-APC（绿色）与SC-UPC（蓝色）光纤连接插头、插座的说法，以下错误的是（）。

A、SC-APC的光纤端面是呈8°斜角的，而SC-UPC的光纤端面是平面

B、SC-APC与SC-UPC直接对接会增加3dB的衰减，且容易损坏光纤端面

C、SC-APC型光纤跳线主要用于广播电视领域（光纤CATV），因为其可有效回波损耗小

D、都是SC型，所以SC-APC插头的光纤跳线可以用于SC-UPC光接口的ONU连接；