问题 填空题

分请用化学用语表示或写出符号的意义:

①氢氧根离子         ;    ②二氧化硫中硫元素的化合价          

③3H2O               ;  ④空气中含量最多的物质_             _。

答案

(4分)(1) ①OH-     ②    ③3个水分子      ④N2

题目分析:①氢氧根离子:OH-;    ②二氧化硫中硫元素的化合价:

③3H2O:3个水分子;  ④空气中含量最多的物质:N2

点评:这是考试的重点内容之一,但难度不大,元素用元素符号表示;原子用元素符号表示,若表示原子个数,就在元素符号前标上适当的数字;分子用化学式表示,表示分子的个数,就在化学式前加上适当数字表示;离子则在元素符号右上角标上适当的电荷数就行了,化合价标注在元素符号的正上方。

阅读理解

My first visit to Angkor Wat(吴哥窟) was in 1980. The country had been at war for many years and the temple was deserted and falling to pieces. Plants were growing out of the roofs, and trees were growing in the courtyards.

Today, the temple is the scene of a busy repair program. A team of 15 Indian experts are organizing a workforce of 400 Cambodians, most of them women, who are cleaning, repairing and rebuilding parts of this temple.

  As I walked through the courtyards, I noticed the Cambodian women devote hours to cleaning carefully a tiny area of stone. Boards are laid down to protect the precious painted stones while the repair work is going on. There are very few machines and little heavy equipment. Workers carry building materials in buckets at the end of long poles. Piles of stones lie in a corner of the courtyard, waiting to be replaced.    

  The work of cleaning the stones is watched over by three Indian chemists. It is a very slow task. First they clean the stones with brushes using buckets of a weak chemical. Then gaps between the stones are filled in. Finally another material is painted onto the stones which will protect them from water forever.

Work starts every day at 7 a. m. and goes on until late afternoon six days a week, with a break at midday.

Evening is the best time to visit the temple, after the tour groups have left. As the sun sinks lower, shadows spread across the courtyard. After sunset, the sky turns pink. The grey stone towers take on a golden color before turning pink. Nowhere else in the world can there be such a quiet, beautiful place.

小题1:This passage mainly tells ________.

A.the poor look of the temple Angkor Wat in 1980

B.the history of the temple Angkor Wat

C.the repair work being done to the temple Angkor Wat

D.the difficulty in the repair work小题2:According to the author, which of the following plays the LEAST important role in the repair work?

A.The women workers.

B.The Indian workers

C.Machines

D.Skilled workers小题3:The underlined sentence “the temple was deserted” possibly means that _______.

A.there was no one in the temple and it was in a poor state

B.the temple was built on desert and nobody noticed it

C.the temple was very old with a long history

D.the temple was repaired by the Cambodians, most of whom women小题4:To clean the stone, how many steps should be followed?

A.Two

B.Three

C.Four

D.Five小题5:Which work needs a lot of time to do?

A.To get rid of certain types of plants.

B.To carry the building materials.

C.To replace the stones.

D.To clean the stones.

问答题 论述题