在一定条件下，下列物质间的转化不能一步实现的是 A．KMn04→O2B CO→H

下列各句中，没有语病的一句是（）。

A．哺乳期妇女如果仅仅依靠服用补品中的含碘量，就有可能缺碘，若不及时添加含碘食品，则有可能导致婴儿脑神经损伤或智力低下。

B．在这部作品中，并没有给人们多少正面的鼓励和积极的启示，相反，其中一些情节的负面作用倒是不少。

C．当今世界，自主知识产权所占比重是衡量一个国家科学发展水平的标志，而科学技术进步与否是国家富强的标志。

D．如何体会企业文化的深刻内涵，认识用优秀文化提升企业竞争力的重要性，是摆在每一位中国企业家面前的重要课题。

小明学习了化学后，知道石蕊试纸可检验酸溶液或碱溶液．为了检验硫酸的酸性，他用玻璃棒蘸一点浓硫酸在石蕊试纸上，没有看见试纸变红，而是变黑了．小明这一实验不成功的原因是______；小明明白道理后，把浓硫酸进行稀释，他的正确操作是______．

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Ⅲ.完形填空（20分）

Paracutin was born in Mexico in February, 1943. At the end of one week Paracutin was 500 feet high, and it is now over 9,000 feet high. Today Paracutin is  36  .

What is Paracutin? It was the first volcano in the world which was  37  from its eruption right up  38  the present day. On February 20th, 1943, a peasant and his wife set  39  to work in their own fields in the Mexican village of Paracutin. They were  40  to find the earth warm under their feet. Suddenly they heard noise  41  in the earth and a small hole  42  in their fields. In the afternoon there was a sudden loud noise and stones were  43  high in the air. The peasants ran from the fields and turned to watch. They saw the  44  of a volcano.

Large quantities of stones and lava  45  out and a little hill began to  46 . By evening this hill was 100 feet high and hot  47  were falling on the village. At night the strong light of the hot lava  48  up the countryside. The trees near the village were  49  and the villagers had to leave their houses.  50  the village was destroyed, its  51  was given to the volcano. The news quickly reached Mexico City,  52  to the east. Many people came to watch the  53 . The volcano grew for ten years and hundreds of square miles of  54  were destroyed. The Paracutin had gone to sleep  55 .

36.A. asleep                   B. active             C. silent              D. terrible

37.A. changed            B. raised             C. seen               D. grown

38.A. on                    B. to                    C. from              D. by

39.A. about                B. on                 C. up                  D. out

40.A. frightened         B. surprised         C. worried          D. disappointed

41.A. deep                 B. nearby              C. outside           D. from far

42.A. erupted             B. appeared         C. remained               D. rose

43.A. thrown              B. drawn             C. pushed            D. flown

44.A. access               B. shape              C. birth               D. crash

45.A. wiped                      B. broke             C. made             D. stood

46.A. rise                   B. fall                 C. form              D. spread

47.A. mud                 B. ashes              C. virus              D. powders

48.A. called                      B. added             C. filled              D. lit

49.A. cut                   B. killed             C. lacked            D. buried

50.A. Before              B. Since              C. When             D. If

51.A. name                B. place              C. address           D. spot

52.A. away                B. far                 C. off                 D. back

53.A. nature                      B. wonder           C. scene              D. sign

54.A. forest                B. houses            C. land                      D. villages

55.A. from now on     B. by now           C. just now         D. until now

甲溶液的pH=2.0，乙溶液的pH=4.0，甲乙两溶液的氢离子浓度相差的倍数为( )。

A．20倍
B．40倍
C．80倍
D．100倍

一级公路中线放样宜采用（）进行测量放样。

A.切线支距法

B.偏角法

C.穿线交点法

D.坐标法