[填空题]When we compare men with animals, we must remember that a man is also an animal. But in making this comparison, it is sometimes more convenient to refer to the rest of the animal kingdom as "animals".
(1) .
Many animals are intelligent in the sense that they can explore their surroundings or acquire new skills by learning from their parents. Animal organisms have organs whose physical power exceeds the power of men. The bodies of men have no wings and cannot fly. Men cannot imitate fish and spend long periods under water unless they carry breathing apparatus with them.
(2) . But it is very uncommon for animals to go mad or destroy their own kind. Animals, left to themselves, do not disturb the balance of nature. They do not turn grassland into desert or make water undrinkable by filling whole lakes and rivers with waste materials. Compared with most other organisms—if we see him as a part of nature—man is wasteful and destructive. Though he is more intell

When imaginative men turn their eyes towards space and wonder whether life exists in any part of it, they may cheer themselves by remembering that life need not resemble closely the life that exists on Earth. Mars looks like the only planet where life like ours could exist, and even this is doubtful. But there may be other kinds of life based on other kinds of chemistry, and they may multiply on Venus or Jupiter. At least we cannot prove at present that they do not.
Even more interesting is the possibility that life on their planets may be in a more advanced stage of evolution. Present-day man is in a peculiar and probably temporary stage. His individual units retain a strong sense of personality. They are, in fact, still capable under favorable circumstances of leading individual lives. But man s societies are already sufficiently developed to have enormously more power and effectiveness than the individuals have.
It is not likely that this transitional situation
A. Imaginative men are sure of success in finding life on other planets.
B. Imaginative men are delighted to find life on other planets.
C. Imaginative men are happy to find a different kind of life existing on other planets.
D. Imaginative men can be pleased with the idea that there might exist different forms of life on other planets.