25. The main point of the passage is the author's ________.

A) interest in the failure of the Skylab

B) willingness to give his advice

C) concern that science cannot answer all questions

D) eagerness to see more new scientific discoveries

Questions 26 to 30 are based on the following passage:

As supplier of most of the food we eat and of raw materials for many industrial processes, agriculture is clearly an important area of the economy. But the industrial performance of agriculture (the relative efficiency of agricultural production compared to other areas in the economy) is even more imp