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问题 填空题

（12分）下列为A、B、C、D四种物质的转化关系，a、b为反应条件，

（1）若A为单质，a为点燃，b为催化剂、加热，则A为         （填写化学式），

写出B→C的方程式                                                   。

（2）若A为气态化合物，B→C转化不需要条件，则A为         （填写化学式），

写出A→B化学方程式                                                 。

写出Cu+D溶液→B的离子方程式                                       。

（3）把某黑色固体Y加热至红热，投入到上述某种无色溶液D中产生两种气体组成的混合气体X，将X做如下所示实验：

写出M、G所代表物质的化学式 M                G                 

答案

（1+2分）（1）S；2SO2+O2=2SO3（加热、催化剂、可逆反应）；

（1+2+2分）（2）NH3；4NH3+5O2=4NO+6H2O（加热、催化剂）；3Cu+8H++2NO3-=3Cu2++2NO↑+4H2O

（2+2分）（3）NO、CO2（答1个0分）；   Cu(NO3)2

单项选择题

As one works with color in a practical, or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile, changeable thing (1) to a large extent on the relationship of the color (2) other colors (3) simultaneously. It is not (4) in its relation to the direct stimulus which (5) it. On the other hand, the properties of surfaces that give (6) to color do not seem to change greatly under a wide variety of illumination color, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to be (7) in large part to the mechanism of color (8) .

When the eye is (9) to a colored area, there is an immediate readjustment of the (10) of the eye to color in and around the area (11) . This readjustment does not promptly affect the color seen but usually does affect the next area to which the (12) is shifted. The longer the time of viewing, the higher the (13) , and the larger the area, the greater the effect will be (14) its persistence in the (15) viewing situation. As indicated by the work of Wright and Schouten, it appears that, at (16) for a first approximation, full adaptation takes place over (17) time if the adapting source is moderately bright and the eye has been in (18) darkness just previously. Also, (19) of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become (20) over the whole eye.

12（）

A.cheer

B.sense

C.gaze

D.thought
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单项选择题 B1型题

神经细胞动作电位的主要组成是（）

A.锋电位

B.阈电位

C.负后电位

D.局部电位

E.正后电位
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