A solar pump(太阳能水泵 ) was built in a desert small village. The pump used the deserts most common resource – sunlight, to increase its greatest need, water. Solar collectors were used to collect the sun’s rays. Flat collectors were used instead of concave (凹的) collectors. Flat collectors can be still and do not have moving parts, which can be broken in sandstorms. The system used the 20C temperature difference between the solar collectors and the ground water to work a steam engine which pumped water from under the ground.
Some of the social effects of the new pump were planed for. Children aged 6—15 used to meet the old men to receive the informal education there. In order to replace this, a school was also included in the project. But the project had not considered the traditional power structure of the village. As soon as the foreign experts left, the two richest men in the village took control of the pump and started selling water to everyone else. The result was that the majority of the people were poorer than before.
16. The basic function of the solar collectors is to ______
A. pump water           B. gather the sun’s rays 
C. start engine            D. raise the temperature
17. According to the passage which of the following statements could be true?
A. Solar collectors were concave collectors               
B. Flat collectors can be broken in sandstorms.
C. Concave collectors may be have moving parts.     
D. A solar pump is a solar collectors.
18. The underground water is pumped by means of ______.
A. solar collectors  B. the 20C temperature difference C. the system  D. a steam engine
19. Another plan was also included that_____.
A. some new pumps were to built ,too
B. children from aged 6—15 were required to meet old men.
C. a new school would take the place of the informal education.
D. the richest men in the village would control the pump.
20. From this passage , it can be inferred that_____.
A. the project was good , but people there disliked it.
B. only few rich men supported the project.
C. the project was successful even though it only brought good social effects to fewer villagers.
D. the project was a complete failure, because the result was against its purpose.